KTM s spring weight chart ?

MX558
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MX558
Edited Date/Time 2/24/2024 6:23am

They give you weight charts for the rear spring in the manual so I'm wondering if it's with gear or without, it doesn't say . I have a 22 350 and am 180 with out gear . Thanks 

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MX558
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MX558 2/24/2024 8:39am
2/24/2024 8:39am

Oh I should note I can get ok sag numbers in the perimeter with both OEM and 4.5  springs 

FGR01
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FGR01 2/24/2024 12:25pm
2/24/2024 12:25pm

I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a 45 or 48Nm on that 350.  I am running a 45 on mine and happy with it.  Some guys might prefer a 48.  

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aees
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aees 2/24/2024 1:22pm
2/24/2024 1:22pm
MX558 wrote:

Oh I should note I can get ok sag numbers in the perimeter with both OEM and 4.5  springs 

Its truly a preference question. Are you tall? Then most likely go up.

I'm 200, running 48, get pretty much 38/104, or 40/106 with 6-7mm preload. 450 2022.

35-36 on OEM shock is low = go up so you get 37-40 at least. Even 37 on rough track is a bit low.

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MX558
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MX558 2/24/2024 1:56pm
2/24/2024 1:56pm
FGR01 wrote:
I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a...

I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a 45 or 48Nm on that 350.  I am running a 45 on mine and happy with it.  Some guys might prefer a 48.  

I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is 40\ 105 with very little preload on the spring . 

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FGR01
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FGR01 2/24/2024 3:55pm
2/24/2024 3:55pm
FGR01 wrote:
I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a...

I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a 45 or 48Nm on that 350.  I am running a 45 on mine and happy with it.  Some guys might prefer a 48.  

MX558 wrote:
I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is...

I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is 40\ 105 with very little preload on the spring . 

Measure the spring compressed length to know exactly how much preload you have.   The Austrian bikes don't use a whole lot of preload to begin with.  They call for 7mm as nominal and basically you don't want to get outside of about 5-10mm ideally.   I'm generally running 8-9mm of preload with the 45Nm spring.

MX558
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MX558 2/24/2024 6:29pm
2/24/2024 6:29pm
FGR01 wrote:
I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a...

I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a 45 or 48Nm on that 350.  I am running a 45 on mine and happy with it.  Some guys might prefer a 48.  

MX558 wrote:
I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is...

I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is 40\ 105 with very little preload on the spring . 

FGR01 wrote:
Measure the spring compressed length to know exactly how much preload you have.   The Austrian bikes don't use a whole lot of preload to begin with. ...

Measure the spring compressed length to know exactly how much preload you have.   The Austrian bikes don't use a whole lot of preload to begin with.  They call for 7mm as nominal and basically you don't want to get outside of about 5-10mm ideally.   I'm generally running 8-9mm of preload with the 45Nm spring.

Thanks , I'm riding tomorrow to see how it goes 

cwel11
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cwel11 2/25/2024 3:40am
2/25/2024 3:40am
MX558 wrote:
I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is...

I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is 40\ 105 with very little preload on the spring . 

FGR01 wrote:
Measure the spring compressed length to know exactly how much preload you have.   The Austrian bikes don't use a whole lot of preload to begin with. ...

Measure the spring compressed length to know exactly how much preload you have.   The Austrian bikes don't use a whole lot of preload to begin with.  They call for 7mm as nominal and basically you don't want to get outside of about 5-10mm ideally.   I'm generally running 8-9mm of preload with the 45Nm spring.

MX558 wrote:

Thanks , I'm riding tomorrow to see how it goes 

Same bike (23 mc350) same approximate weight. I ran the stock 4.2 with good sag numbers but now that the bike has broken in I’ve started getting more fender tire rub and have now gone to the 4.5 which I always ran on my 22 FC350. Depending on your gear and speed you may have to bump up one spring. 

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MX558
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MX558 2/25/2024 6:10am
2/25/2024 6:10am
FGR01 wrote:
Measure the spring compressed length to know exactly how much preload you have.   The Austrian bikes don't use a whole lot of preload to begin with. ...

Measure the spring compressed length to know exactly how much preload you have.   The Austrian bikes don't use a whole lot of preload to begin with.  They call for 7mm as nominal and basically you don't want to get outside of about 5-10mm ideally.   I'm generally running 8-9mm of preload with the 45Nm spring.

MX558 wrote:

Thanks , I'm riding tomorrow to see how it goes 

cwel11 wrote:
Same bike (23 mc350) same approximate weight. I ran the stock 4.2 with good sag numbers but now that the bike has broken in I’ve started...

Same bike (23 mc350) same approximate weight. I ran the stock 4.2 with good sag numbers but now that the bike has broken in I’ve started getting more fender tire rub and have now gone to the 4.5 which I always ran on my 22 FC350. Depending on your gear and speed you may have to bump up one spring. 

I have 4.5 on now and hardly ever get fender rub . I am 59 and vet intermediate speed I guess 

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cwel11
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cwel11 2/25/2024 9:15am
2/25/2024 9:15am
MX558 wrote:

Thanks , I'm riding tomorrow to see how it goes 

cwel11 wrote:
Same bike (23 mc350) same approximate weight. I ran the stock 4.2 with good sag numbers but now that the bike has broken in I’ve started...

Same bike (23 mc350) same approximate weight. I ran the stock 4.2 with good sag numbers but now that the bike has broken in I’ve started getting more fender tire rub and have now gone to the 4.5 which I always ran on my 22 FC350. Depending on your gear and speed you may have to bump up one spring. 

MX558 wrote:

I have 4.5 on now and hardly ever get fender rub . I am 59 and vet intermediate speed I guess 

Your sag numbers should be good then I’d guess

FahQ
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FahQ 2/25/2024 9:21am
2/25/2024 9:21am

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aees
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aees 2/25/2024 3:06pm
2/25/2024 3:06pm
FGR01 wrote:
I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a...

I think they are meant for "total weight" as in with gear.   At 180 you are same size as me.  We are pretty borderline between a 45 or 48Nm on that 350.  I am running a 45 on mine and happy with it.  Some guys might prefer a 48.  

MX558 wrote:
I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is...

I just had the forks softened up Kyb spring conversation and now seems a little out of balance with rear too stiff . My sag is 40\ 105 with very little preload on the spring . 

Then go down a spring rate if you feel balance is off. You can run 38/105 with softer spring and get more preload on it.

 

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MX558
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MX558 2/25/2024 3:36pm
2/25/2024 3:36pm

Rode today on a good track with a mix of everything. The bike worked pretty well . My sag in gear 40 -105 the bike was pretty good . I think I might try lighter spring just for the hell of it . I will say now that I softened the forks they work awesome. Thanks for all the help guys 

FGR01
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FGR01 2/25/2024 6:25pm
2/25/2024 6:25pm

Adding this.. before you swap springs again, try opening the HSC on the shock about 1/8 or 1/4 turn.  It has quite an impact on bike attitude and balance.

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