2017 ktm 150 light weight build

barnett468
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barnett468 7/29/2018 11:47am
7/29/2018 11:47am Edited Date/Time 7/29/2018 11:49am
I just saw on the site that some guy here broke is steel KTM frame in half, perhaps they should have made out out of 7068 aluminum since it has a higher ultimate shear strength than many steels.

https://m.vitalmx.com/forums/Moto-Related,20/KTM-frame-failure-2016-sx3…

CrGuy2T
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CrGuy2T 7/29/2018 1:27pm
7/29/2018 1:27pm
barnett468 wrote:
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be...
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be willing to bet there are not very many (or any perhaps but I could be wrong) & there is a reason for that..."

That question is actually irrelevant. There are very few companies making axles from titanium even though it is extremely strong and readily available and there is a reason for that also, however, below is a link to one company that currently makes aluminum axles and there are one or two others. The axles below are for drag race and road race bikes that go in excess of 130 mph with some bikes weighing maybe 40% more than many late model motocross bikes.

https://www.saeoutlawperformance.com/CBR-conversion-axle-for-GSXR-1000-…




"In addition aluminum is 1/3 the stiffness of steel based alloys no matter what alloy or heat-treat it may be. A very simple example could be If we put an equal size steel bar & an alum bar in a wall & start to hang equal weights on the ends of these bars the bars deflect elastically under the load. As we add load equally, that the aluminum bar is deflected three times as much as the steel."

This is also irrelevant since all metals will in fact "bend" under a certain load. The thing that is relevant is simply designing the part in question so it will perform sufficiently for its intended use.
Are you using aluminum axles? I like to stick with what I know works and what’s safe. Once these aluminum axles are tested and deemed safe I’ll be happy to use them. I haven’t heard anyone using them in the mx industry. I’m very familiar with metallurgy. I’m not trying to turn my thread into an engineering thread. It’s nist a simple build that could be potentially be lighter than stock with all fluids. Thanks for the input. I’ve weighed forks and shock with the scale. I am not sure where the scale came from.
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blackdiamond
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blackdiamond 7/29/2018 4:18pm
7/29/2018 4:18pm
barnett468 wrote:
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be...
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be willing to bet there are not very many (or any perhaps but I could be wrong) & there is a reason for that..."

That question is actually irrelevant. There are very few companies making axles from titanium even though it is extremely strong and readily available and there is a reason for that also, however, below is a link to one company that currently makes aluminum axles and there are one or two others. The axles below are for drag race and road race bikes that go in excess of 130 mph with some bikes weighing maybe 40% more than many late model motocross bikes.

https://www.saeoutlawperformance.com/CBR-conversion-axle-for-GSXR-1000-…




"In addition aluminum is 1/3 the stiffness of steel based alloys no matter what alloy or heat-treat it may be. A very simple example could be If we put an equal size steel bar & an alum bar in a wall & start to hang equal weights on the ends of these bars the bars deflect elastically under the load. As we add load equally, that the aluminum bar is deflected three times as much as the steel."

This is also irrelevant since all metals will in fact "bend" under a certain load. The thing that is relevant is simply designing the part in question so it will perform sufficiently for its intended use.
Keep in mind all of the applications you mentioned above that use aluminum axles never leave the ground. BIG difference.
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blackdiamond
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blackdiamond 7/29/2018 4:20pm
7/29/2018 4:20pm
CrGuy2T wrote:
I’m not tonsure about aluminum axles. I did manage to use a silencer off my 03 kx. It’s an old factory one and saved over 2lbs...
I’m not tonsure about aluminum axles. I did manage to use a silencer off my 03 kx. It’s an old factory one and saved over 2lbs. It actually fit near perfect.



That silencer looks bad ass on there it looks like it fits like a glove.

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barnett468
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barnett468 7/29/2018 4:23pm
7/29/2018 4:23pm Edited Date/Time 7/29/2018 4:45pm
barnett468 wrote:
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be...
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be willing to bet there are not very many (or any perhaps but I could be wrong) & there is a reason for that..."

That question is actually irrelevant. There are very few companies making axles from titanium even though it is extremely strong and readily available and there is a reason for that also, however, below is a link to one company that currently makes aluminum axles and there are one or two others. The axles below are for drag race and road race bikes that go in excess of 130 mph with some bikes weighing maybe 40% more than many late model motocross bikes.

https://www.saeoutlawperformance.com/CBR-conversion-axle-for-GSXR-1000-…




"In addition aluminum is 1/3 the stiffness of steel based alloys no matter what alloy or heat-treat it may be. A very simple example could be If we put an equal size steel bar & an alum bar in a wall & start to hang equal weights on the ends of these bars the bars deflect elastically under the load. As we add load equally, that the aluminum bar is deflected three times as much as the steel."

This is also irrelevant since all metals will in fact "bend" under a certain load. The thing that is relevant is simply designing the part in question so it will perform sufficiently for its intended use.
CrGuy2T wrote:
Are you using aluminum axles? I like to stick with what I know works and what’s safe. Once these aluminum axles are tested and deemed safe...
Are you using aluminum axles? I like to stick with what I know works and what’s safe. Once these aluminum axles are tested and deemed safe I’ll be happy to use them. I haven’t heard anyone using them in the mx industry. I’m very familiar with metallurgy. I’m not trying to turn my thread into an engineering thread. It’s nist a simple build that could be potentially be lighter than stock with all fluids. Thanks for the input. I’ve weighed forks and shock with the scale. I am not sure where the scale came from.
Yes, I am using them. Some materials may be illegal to use in some areas in pro racing, but even if aluminum was legal to use for axles they still may not use it for various reasons but not necessarily because of their limited fatigue life etc. The AMA used to allow titanium axles but changed the rules so ti axles were illegal, but that doesn't mean that there was an inherent problem with using titanium for axles. Steel axles will fail if they are not properly designed. This being said, I wouldn't put them on Eli Tomacs bike, but that's not because I think they would instantly break, but I am not even half as fast or half as hard on my bike as he is either so I have no concerns about mine ever failing.

If one wanted to scientifically determine the actual load on the axles they would have to use some type of telemetry machine or accelleromoter fixed to the front and rear axle location etc. With this info, they could plot some type of rudimentary fatigue graph as well.
barnett468
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barnett468 7/29/2018 4:25pm
7/29/2018 4:25pm Edited Date/Time 7/29/2018 4:43pm
barnett468 wrote:
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be...
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be willing to bet there are not very many (or any perhaps but I could be wrong) & there is a reason for that..."

That question is actually irrelevant. There are very few companies making axles from titanium even though it is extremely strong and readily available and there is a reason for that also, however, below is a link to one company that currently makes aluminum axles and there are one or two others. The axles below are for drag race and road race bikes that go in excess of 130 mph with some bikes weighing maybe 40% more than many late model motocross bikes.

https://www.saeoutlawperformance.com/CBR-conversion-axle-for-GSXR-1000-…




"In addition aluminum is 1/3 the stiffness of steel based alloys no matter what alloy or heat-treat it may be. A very simple example could be If we put an equal size steel bar & an alum bar in a wall & start to hang equal weights on the ends of these bars the bars deflect elastically under the load. As we add load equally, that the aluminum bar is deflected three times as much as the steel."

This is also irrelevant since all metals will in fact "bend" under a certain load. The thing that is relevant is simply designing the part in question so it will perform sufficiently for its intended use.
blackdiamond wrote:
Keep in mind all of the applications you mentioned above that use aluminum axles never leave the ground. BIG difference.
That's irrelevant, and incorrect. The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally leave the ground nearly as far as they do on an mx bike but that doesn't matter as long as the axles are strong enough to support the load.


barnett468
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barnett468 7/29/2018 4:37pm
7/29/2018 4:37pm
blackdiamond
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blackdiamond 7/29/2018 4:40pm
7/29/2018 4:40pm
barnett468 wrote:
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be...
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be willing to bet there are not very many (or any perhaps but I could be wrong) & there is a reason for that..."

That question is actually irrelevant. There are very few companies making axles from titanium even though it is extremely strong and readily available and there is a reason for that also, however, below is a link to one company that currently makes aluminum axles and there are one or two others. The axles below are for drag race and road race bikes that go in excess of 130 mph with some bikes weighing maybe 40% more than many late model motocross bikes.

https://www.saeoutlawperformance.com/CBR-conversion-axle-for-GSXR-1000-…




"In addition aluminum is 1/3 the stiffness of steel based alloys no matter what alloy or heat-treat it may be. A very simple example could be If we put an equal size steel bar & an alum bar in a wall & start to hang equal weights on the ends of these bars the bars deflect elastically under the load. As we add load equally, that the aluminum bar is deflected three times as much as the steel."

This is also irrelevant since all metals will in fact "bend" under a certain load. The thing that is relevant is simply designing the part in question so it will perform sufficiently for its intended use.
blackdiamond wrote:
Keep in mind all of the applications you mentioned above that use aluminum axles never leave the ground. BIG difference.
barnett468 wrote:
That's irrelevant, and incorrect. The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally...
That's irrelevant, and incorrect. The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally leave the ground nearly as far as they do on an mx bike but that doesn't matter as long as the axles are strong enough to support the load.


You need a "scientific test" to determine that you catch air when you ride moto?

Or did I miss something?
barnett468
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barnett468 7/29/2018 4:53pm
7/29/2018 4:53pm Edited Date/Time 7/29/2018 4:56pm
blackdiamond wrote:
Keep in mind all of the applications you mentioned above that use aluminum axles never leave the ground. BIG difference.
barnett468 wrote:
That's irrelevant, and incorrect. The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally...
That's irrelevant, and incorrect. The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally leave the ground nearly as far as they do on an mx bike but that doesn't matter as long as the axles are strong enough to support the load.


blackdiamond wrote:
You need a "scientific test" to determine that you catch air when you ride moto?

Or did I miss something?
Well yes, it does seem to me that you missed something, which is the part in my post you actually quoted that not only implies that the wheels/axles leave the ground on an mx bike, but that they leave the ground by a much greater distance than they do on some other types of bikes. I have posted it again below for you in hopes that it will be easier for you to find this time.

"The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally leave the ground nearly as far as they do on an mx bike but that doesn't matter as long as the axles are strong enough to support the load."




CrGuy2T
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CrGuy2T 7/29/2018 5:06pm
7/29/2018 5:06pm
I’m not agreeing or disagreeing I’ve just never heard of this. Do you have any pics of your axles new and after a few rides?
barnett468
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barnett468 7/29/2018 5:28pm
7/29/2018 5:28pm Edited Date/Time 7/29/2018 5:34pm
CrGuy2T wrote:
I’m not agreeing or disagreeing I’ve just never heard of this. Do you have any pics of your axles new and after a few rides?
Not at the moment because I never had a need to photo them, but the next time I take them out I will gladly post photos. Bear in mind that I am referring to 7068 aluminum only, which is a day and night difference from both 6061 and 7075.

Below is a general comparison between 6061 and 7075 aluminum, and the 7068 is around 25% stronger than the 7075 in several areas.

https://www.makeitfrom.com/compare/6061-T6-Aluminum/7075-T6-Aluminum



blackdiamond
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blackdiamond 7/29/2018 5:32pm
7/29/2018 5:32pm
barnett468 wrote:
That's irrelevant, and incorrect. The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally...
That's irrelevant, and incorrect. The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally leave the ground nearly as far as they do on an mx bike but that doesn't matter as long as the axles are strong enough to support the load.


blackdiamond wrote:
You need a "scientific test" to determine that you catch air when you ride moto?

Or did I miss something?
barnett468 wrote:
Well yes, it does seem to me that you missed something, which is the part in my post you actually quoted that not only implies that...
Well yes, it does seem to me that you missed something, which is the part in my post you actually quoted that not only implies that the wheels/axles leave the ground on an mx bike, but that they leave the ground by a much greater distance than they do on some other types of bikes. I have posted it again below for you in hopes that it will be easier for you to find this time.

"The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally leave the ground nearly as far as they do on an mx bike but that doesn't matter as long as the axles are strong enough to support the load."




I stand corrected.

Moto GP bikes do in fact "leave the ground" at times.

My apologies.





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barnett468
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barnett468 7/29/2018 5:35pm
7/29/2018 5:35pm
barnett468
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barnett468 7/29/2018 5:49pm
7/29/2018 5:49pm Edited Date/Time 7/29/2018 6:53pm
blackdiamond wrote:
You need a "scientific test" to determine that you catch air when you ride moto?

Or did I miss something?
barnett468 wrote:
Well yes, it does seem to me that you missed something, which is the part in my post you actually quoted that not only implies that...
Well yes, it does seem to me that you missed something, which is the part in my post you actually quoted that not only implies that the wheels/axles leave the ground on an mx bike, but that they leave the ground by a much greater distance than they do on some other types of bikes. I have posted it again below for you in hopes that it will be easier for you to find this time.

"The wheels/axles on drag race and road race and street bikes can and do sometimes "leave the ground". Obviously they don't intentionally leave the ground nearly as far as they do on an mx bike but that doesn't matter as long as the axles are strong enough to support the load."




blackdiamond wrote:
I stand corrected. Moto GP bikes do in fact "leave the ground" at times. My apologies. [img]https://p.vitalmx.com/photos/forums/2018/07/29/277665/s1200_jorege_lorenzo_crashes_at_laguna_seca_motogp.jpg[/img]
I stand corrected.

Moto GP bikes do in fact "leave the ground" at times.

My apologies.





No prob, however, it seems you missed the video posted below when you were searching for "GP motorcycles in the air" or something similar. Also, if these bikes weighed twice as much as an mx bike, you can multiply the distance they are actually off the ground and then compare it.

https://www.youtube.com/watch?v=eyFDMQeQO_I

.
cdoggy81
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cdoggy81 7/29/2018 9:06pm
7/29/2018 9:06pm Edited Date/Time 7/30/2018 8:07am
You guys are wasting your time with barnett468. Next thing you know this will turn into a debate over how to properly use the word regardless (not irregardless)... That is unless he goes back & deletes it or edits his old thread LoL ?
7068 is a great alloy, yeah, we get it... Can we get back to CrGuy2t’s thread now?
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BobPA
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BobPA 7/29/2018 10:10pm
7/29/2018 10:10pm
Folks, we got a turd in the punch bowl...
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barnett468
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barnett468 7/29/2018 10:11pm
7/29/2018 10:11pm Edited Date/Time 7/29/2018 10:19pm
cdoggy81 wrote:
You guys are wasting your time with barnett468. Next thing you know this will turn into a debate over how to properly use the word regardless...
You guys are wasting your time with barnett468. Next thing you know this will turn into a debate over how to properly use the word regardless (not irregardless)... That is unless he goes back & deletes it or edits his old thread LoL ?
7068 is a great alloy, yeah, we get it... Can we get back to CrGuy2t’s thread now?
ummm...your comments regarding the word regardless make no sense, but that's no surprise, lol, irregardless, your comment about 7068 aluminum is correct.
barnett468
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barnett468 7/29/2018 10:14pm
7/29/2018 10:14pm Edited Date/Time 7/30/2018 7:04am
BobPA wrote:
Folks, we got a turd in the punch bowl...
That's not a very kind thing to say about cdoggy81 even though overall his last post was a bit rude, inappropriate and not constructive.

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Jrewing
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Jrewing 7/30/2018 1:47am
7/30/2018 1:47am Edited Date/Time 7/30/2018 5:02am
barnett468 wrote:
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be...
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be willing to bet there are not very many (or any perhaps but I could be wrong) & there is a reason for that..."

That question is actually irrelevant. There are very few companies making axles from titanium even though it is extremely strong and readily available and there is a reason for that also, however, below is a link to one company that currently makes aluminum axles and there are one or two others. The axles below are for drag race and road race bikes that go in excess of 130 mph with some bikes weighing maybe 40% more than many late model motocross bikes.

https://www.saeoutlawperformance.com/CBR-conversion-axle-for-GSXR-1000-…




"In addition aluminum is 1/3 the stiffness of steel based alloys no matter what alloy or heat-treat it may be. A very simple example could be If we put an equal size steel bar & an alum bar in a wall & start to hang equal weights on the ends of these bars the bars deflect elastically under the load. As we add load equally, that the aluminum bar is deflected three times as much as the steel."

This is also irrelevant since all metals will in fact "bend" under a certain load. The thing that is relevant is simply designing the part in question so it will perform sufficiently for its intended use.
blackdiamond wrote:
Keep in mind all of the applications you mentioned above that use aluminum axles never leave the ground. BIG difference.
Isle of man street racing? Heavy loads there but doubt anybody there uses them
Id use them if they were available
barnett468
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barnett468 7/30/2018 7:39am
7/30/2018 7:39am Edited Date/Time 7/30/2018 8:51am
barnett468 wrote:
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be...
"Barnett468 - can you show me a reputable company (like racetech for example) that makes 7068 aluminum axles for KTM, YZ’s CR’s etc? I would be willing to bet there are not very many (or any perhaps but I could be wrong) & there is a reason for that..."

That question is actually irrelevant. There are very few companies making axles from titanium even though it is extremely strong and readily available and there is a reason for that also, however, below is a link to one company that currently makes aluminum axles and there are one or two others. The axles below are for drag race and road race bikes that go in excess of 130 mph with some bikes weighing maybe 40% more than many late model motocross bikes.

https://www.saeoutlawperformance.com/CBR-conversion-axle-for-GSXR-1000-…




"In addition aluminum is 1/3 the stiffness of steel based alloys no matter what alloy or heat-treat it may be. A very simple example could be If we put an equal size steel bar & an alum bar in a wall & start to hang equal weights on the ends of these bars the bars deflect elastically under the load. As we add load equally, that the aluminum bar is deflected three times as much as the steel."

This is also irrelevant since all metals will in fact "bend" under a certain load. The thing that is relevant is simply designing the part in question so it will perform sufficiently for its intended use.
blackdiamond wrote:
Keep in mind all of the applications you mentioned above that use aluminum axles never leave the ground. BIG difference.
Jrewing wrote:
Isle of man street racing? Heavy loads there but doubt anybody there uses them
Id use them if they were available
Yes, lots of force applied there as well, and nobody there uses aluminum axles, and at least one major reason why is, because although most aluminum alloys have a higher ultimate sheer strength than most common steels, the aluminum has a much lower shear modulus than steel. In general, shear modulus is a measurement of how much force it takes to bend a material a particular amount or to the point where it will be permanently deformed etc, so basically, the aluminum will flex under much less load than steel as another person mentioned, and the amount of flex can be enough at high speed to adversely affect the stability of a road race bike. This being said, even if it still flexes a little on a motocross bike, it is irrelevant because it can't be noticed due to the small amount it flexes and the much lower speeds of the bike and the terrain they are ridden on.

The few people that do use the aluminum axles in recreational road racing aren't going nearly the speeds of pro road racers, and I have not seen any comments from these particular people saying that they noticed any difference in steering or stability although there may still be a small amount.

With the concern some seem to have about the amount aluminum flexes compared to steel, I think it's interesting to note that even titanium flexes much more than steel yet this doesn't seem to concern them, but that may be because they didn't know and just assumed it didn't.

SHEAR MODULUS

A36 (mild) steel ……………………………………… 11,500 ksi
4130 chromoly steel …………………………….….. 11,600 ksi
Grade 5 titanium ………………………..……..….….. 6,380 ksi
6061 T6 aluminum ............………………........…..... 3,770 ksi
7075 T6 aluminum ……………..………...………….. 3,900 ksi


It's also important to bear in mind that some axles are hollow, and if they are replaced with solid aluminum, then the difference between some aspects of the strength between the two changes, making the difference in the shear modulus smaller between the two while making the difference in the shear strength even greater. The rear axle on my bike was hollow and the aluminum axle I had made was solid.





CrGuy2T
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CrGuy2T 7/30/2018 2:16pm
7/30/2018 2:16pm
BenC711 wrote:
Zeta make Ti axles, I have a set in my kxf250 and my kx125. Fit perfectly and quite reasonable for the quality

http://zeta-racing.com/ztitanium/axle_shaft.html
I didn’t see pricing. Warp 9 alsonsell them. They quoted my 212.00 ea and they have a pivot as well. Zeta have acam a long way.
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BenC711 7/30/2018 2:30pm
7/30/2018 2:30pm
BenC711 wrote:
Zeta make Ti axles, I have a set in my kxf250 and my kx125. Fit perfectly and quite reasonable for the quality

http://zeta-racing.com/ztitanium/axle_shaft.html
CrGuy2T wrote:
I didn’t see pricing. Warp 9 alsonsell them. They quoted my 212.00 ea and they have a pivot as well. Zeta have acam a long way.
Langston motorsport are a distributor they should carry pricing. I use a lot of the Zeta parts all have been great
chasestevenson599 7/31/2018 8:52am
7/31/2018 8:52am
BenC711 wrote:
Zeta make Ti axles, I have a set in my kxf250 and my kx125. Fit perfectly and quite reasonable for the quality

http://zeta-racing.com/ztitanium/axle_shaft.html
CrGuy2T wrote:
I didn’t see pricing. Warp 9 alsonsell them. They quoted my 212.00 ea and they have a pivot as well. Zeta have acam a long way.
$263 front and $220 rear

https://www.ktm-parts.com/ZT60-5164.html?gclid=CjwKCAjwkYDbBRB6EiwAR0T_…

https://www.ktm-parts.com/ZT60-5264.html?gclid=CjwKCAjwkYDbBRB6EiwAR0T_…
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barnett468 7/31/2018 4:40pm
7/31/2018 4:40pm
Just for reference:

Bridgestone M23 3.00 X 21 ……………………………………………….. 8.818 lbs
Starcross 5 soft 80/100 x 21 ………………………………………………. 7.627 lbs

Cheng Shen 4.60 x 18 …………………………………………………….. 13.558 lbs
Starcross 5 soft 110/100 x 18 ……………………………………….……. 10.890 lbs

Sedona Heavy Duty 4.50/5.10 inner tube ……………………………….. 2.259 lbs
Sedona Standard Duty 4.50/5.10 inner tube ……………………………. 1.748 lbs

CrGuy2T
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CrGuy2T 7/31/2018 5:16pm
7/31/2018 5:16pm
barnett468 wrote:
Just for reference: Bridgestone M23 3.00 X 21 ……………………………………………….. 8.818 lbs Starcross 5 soft 80/100 x 21 ………………………………………………. 7.627 lbs Cheng Shen 4.60 x 18...
Just for reference:

Bridgestone M23 3.00 X 21 ……………………………………………….. 8.818 lbs
Starcross 5 soft 80/100 x 21 ………………………………………………. 7.627 lbs

Cheng Shen 4.60 x 18 …………………………………………………….. 13.558 lbs
Starcross 5 soft 110/100 x 18 ……………………………………….……. 10.890 lbs

Sedona Heavy Duty 4.50/5.10 inner tube ……………………………….. 2.259 lbs
Sedona Standard Duty 4.50/5.10 inner tube ……………………………. 1.748 lbs

Thabks for the info. I’m actually running star cross 5’s and irc tubes at the moment.
Stuntman_600 8/1/2018 5:52am
8/1/2018 5:52am
Love your idea to go lightweight as possible. You may already know but just in case, Pro Bolt USA makes awesome fasteners. 7075 aluminum & titanium. Race spec drilled are as light as bolts get and etched logo looks bad ass. Each to his own but IMO 7075-T6 bolts are plenty strong for alot of applications & is the lightest option as well as much cheaper than titanium. Your bikes gonna be killer either way. I just tore down my YZ125 engine to be assembled with Pro Bolt USA fasteners throughout.
CrGuy2T
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CrGuy2T 8/1/2018 6:11am
8/1/2018 6:11am
Stuntman_600 wrote:
Love your idea to go lightweight as possible. You may already know but just in case, Pro Bolt USA makes awesome fasteners. 7075 aluminum & titanium...
Love your idea to go lightweight as possible. You may already know but just in case, Pro Bolt USA makes awesome fasteners. 7075 aluminum & titanium. Race spec drilled are as light as bolts get and etched logo looks bad ass. Each to his own but IMO 7075-T6 bolts are plenty strong for alot of applications & is the lightest option as well as much cheaper than titanium. Your bikes gonna be killer either way. I just tore down my YZ125 engine to be assembled with Pro Bolt USA fasteners throughout.
Pro bolt charge to much. I’m using titanium though out. It looks really good and doesn’t fade or get the corroded look like aluminum. I have a really good source for ti. The biggest issue I’m about to run into is adding 2lbs for the graphics. Im ok with it though. I guess I’m not so much trying to make it the “lightest” as possible. It will be lighter than stock.



1
Stuntman_600 8/1/2018 7:02am
8/1/2018 7:02am
Yes they aren't cheap that's true. $176 is total of my cart right now for entire engine inside and out with blue anodized aluminum. The Allen heads aren't bad around $1.28 each. Short race spec drilled etched just over $2 with the longest ones at $3.78 each. I respect everyone's right to build their own bike the way they choose for whatever reason. Carry on man. Looks good so far
CrGuy2T
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CrGuy2T 8/1/2018 7:39am
8/1/2018 7:39am
Stuntman_600 wrote:
Yes they aren't cheap that's true. $176 is total of my cart right now for entire engine inside and out with blue anodized aluminum. The Allen...
Yes they aren't cheap that's true. $176 is total of my cart right now for entire engine inside and out with blue anodized aluminum. The Allen heads aren't bad around $1.28 each. Short race spec drilled etched just over $2 with the longest ones at $3.78 each. I respect everyone's right to build their own bike the way they choose for whatever reason. Carry on man. Looks good so far
No doubt your yz will be noce as well.

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