Turned down hub experience

Racer142
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Racer142 6/21/2023 3:38pm
6/21/2023 3:38pm

Yeah I won't lie it's just for looks. I like building these things. But I do intend to ride this bike which is why I'm asking about long term fatigue. 

Racer142
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Racer142 6/21/2023 3:46pm
6/21/2023 3:46pm
Joyner41 wrote:
Second to TCR/Troy and their work… he will be getting a set of 89 YZ250 hubs and another RM set for my 250 in the near...

Second to TCR/Troy and their work… he will be getting a set of 89 YZ250 hubs and another RM set for my 250 in the near future all for the turndown and coat (insert Lil Jon here) treatment. 
 

Also, pics because RMARMY. 
DACB82F5-F7CD-47A0-80B5-A78B3913E223.jpeg?VersionId=7UirfqP4IzkirA2XymqLW8OgKRc

B8DD0C01-D96E-450B-8B82-09203DFBCA70

C620B449-52C8-4D9C-94F3-8A768F294CE6

 

This is what I'm looking for. These were stock rm hubs like i posted? 

Racer142
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Racer142 6/21/2023 3:50pm
6/21/2023 3:50pm
motomind132 wrote:
In some cases you would be correct. This is not the case. The process to machine them off would be more money that's the only reason...

In some cases you would be correct. This is not the case. The process to machine them off would be more money that's the only reason their not taken off. It's strictly left to reduce one step.

Again I have back in the early 2000's confirmed this with multiple people connected to KHI, i dont remember who i talked to in PC its so long ago, xtream team green- Bobby Hewitt at loretta's, Bruce Stjernstrom at red bud in 05. I was running a 05 kx125 and was curious after I saw sipes bikes hub turned down. Matt boni I was told had over 100 hours on his hubs and swapped those race wheels to each of his bikes. I  never had an issue an issue with mine. Doing a 03 kx 144 and having tcr turn them down for me. 

This is what I've read several times. That pros of that period would turn them down and like I said I saw where they even pastrana factory suzuki had a turned down stock front hub and factory rear. But the stories always seemed to be from people who I imagine replaced wheels fairly regularly 😆 🤣 

FGR01
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FGR01 6/21/2023 4:25pm
6/21/2023 4:25pm
motomind132 wrote:
In some cases you would be correct. This is not the case. The process to machine them off would be more money that's the only reason...

In some cases you would be correct. This is not the case. The process to machine them off would be more money that's the only reason their not taken off. It's strictly left to reduce one step.

Again I have back in the early 2000's confirmed this with multiple people connected to KHI, i dont remember who i talked to in PC its so long ago, xtream team green- Bobby Hewitt at loretta's, Bruce Stjernstrom at red bud in 05. I was running a 05 kx125 and was curious after I saw sipes bikes hub turned down. Matt boni I was told had over 100 hours on his hubs and swapped those race wheels to each of his bikes. I  never had an issue an issue with mine. Doing a 03 kx 144 and having tcr turn them down for me. 

Not to dispute and not saying removing them will reduce strength to a failure point, I have no idea.   But if the only reason to not remove them is to save a step and save money, ahhhh...  why not just not put them there in the first place, like many other hubs?  That would really save money.

2

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SEEMEFIRST
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SEEMEFIRST 6/21/2023 4:45pm
6/21/2023 4:45pm
motomind132 wrote:
In some cases you would be correct. This is not the case. The process to machine them off would be more money that's the only reason...

In some cases you would be correct. This is not the case. The process to machine them off would be more money that's the only reason their not taken off. It's strictly left to reduce one step.

Again I have back in the early 2000's confirmed this with multiple people connected to KHI, i dont remember who i talked to in PC its so long ago, xtream team green- Bobby Hewitt at loretta's, Bruce Stjernstrom at red bud in 05. I was running a 05 kx125 and was curious after I saw sipes bikes hub turned down. Matt boni I was told had over 100 hours on his hubs and swapped those race wheels to each of his bikes. I  never had an issue an issue with mine. Doing a 03 kx 144 and having tcr turn them down for me. 

FGR01 wrote:
Not to dispute and not saying removing them will reduce strength to a failure point, I have no idea.   But if the only reason to not...

Not to dispute and not saying removing them will reduce strength to a failure point, I have no idea.   But if the only reason to not remove them is to save a step and save money, ahhhh...  why not just not put them there in the first place, like many other hubs?  That would really save money.

Tooling those ribs in there was no accident. 

If they were casting joints, I would agree that they could be cleaned up, but those were purposefully engineered into the tooling. No idea what steps it would have saved, it obviously added steps.

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Hcallz5
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Hcallz5 6/21/2023 7:43pm
6/21/2023 7:43pm

You can buy a set of hubs

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Racer142
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Racer142 6/22/2023 11:10am
6/22/2023 11:10am
Hcallz5 wrote:

You can buy a set of hubs

Man why didn't I think of that. Just buy new ones. Thanks man you just solved the whole thread asking about turned down hubs. Dry

Luxon MX
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Luxon MX 6/22/2023 11:33am
6/22/2023 11:33am

Without knowing a lot more about the hub, it's hard to say whether those ribs are necessary for strength or not. But just because they're there doesn't mean that they need to be there; many things are not engineered so much as they're designed. This could simply be the case of an engineer/designer putting them in there to better hide the casting lines. Or simply because they felt they looked cool and wanted to "leave their mark" on the bike. It happens all the time in all industries. 

I doubt anyone did an proper engineering analysis on the hub, found it to be too weak, and added those ribs; it's not a very efficient way to increase strength. It's far more efficient to increase the diameter of the portion connecting the hub flanges and change the thickness if needed. 

I bet you could remove those ribs, polish everything up, and it would be just fine. That said, I don't know for sure, and neither does anyone else here. Regardless, doing that is a lot of work! Why not just buy a new aftermarket hub instead?

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GrapeApe
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GrapeApe 6/22/2023 11:37am
6/22/2023 11:37am

Those ribs are actually fan blades meant to direct air to the brake caliper for cooling, if you machine them out your brakes will overheat.

I just made that up.

 

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yak651
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yak651 6/22/2023 2:15pm
6/22/2023 2:15pm

It’s a kx125, pretty sure he’s not blasting SX whoops or triples. Turn them down and have a sweet looking garage queen

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Joyner41
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Joyner41 6/28/2023 5:03am
6/28/2023 5:03am
Joyner41 wrote:
Second to TCR/Troy and their work… he will be getting a set of 89 YZ250 hubs and another RM set for my 250 in the near...

Second to TCR/Troy and their work… he will be getting a set of 89 YZ250 hubs and another RM set for my 250 in the near future all for the turndown and coat (insert Lil Jon here) treatment. 
 

Also, pics because RMARMY. 
DACB82F5-F7CD-47A0-80B5-A78B3913E223.jpeg?VersionId=7UirfqP4IzkirA2XymqLW8OgKRc

B8DD0C01-D96E-450B-8B82-09203DFBCA70

C620B449-52C8-4D9C-94F3-8A768F294CE6

 

Racer142 wrote:

This is what I'm looking for. These were stock rm hubs like i posted? 

Yup. Stockers. 

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