how much weaker do spacers make your fork?

instinctscooter

Silver Member
its just becuase currently i am running 2 bis spacers on my fork to add enough height to my bars and i was wondering how much weaker the forks would be made because of it.
 

instinctscooter

Silver Member
so not loads as i imagine it would as there is much more leverage on the fork. by the way we are talking of like 40mm worth of spacers here, and i dont care that much on the looks btw.
 

Anton

Silver Member
I thought it would make your fork a lot weaker too. I rode an addict fork with spacers and snapped it in a month and I'm a clean rider and mostly ride ledges so either the fork sucked or it was the headset spacers. Why do you need so many headset spacers? What are you running?
 

Grant Schofield

Silver Member
I doubt he riding 40mm of spacers thats almost two inches, and i dont know of any fork thats long enough for 40mm of spacers and compression
 

instinctscooter

Silver Member
I doubt he riding 40mm of spacers thats almost two inches, and i dont know of any fork thats long enough for 40mm of spacers and compression

no its 35mm or 40mm(i think 40), 1x 20 mm, 1x 15mm or 2x 20mm the headtube is a jd bug/b mod and the fork swish(its leagit just a uk only fork). i needed the extra bar height but i dont want to break my fork early.
 

R-Dubya

Steel Member
no bars would actually be stronger as there is less area of bar to bend making them stronger but it is the opposite for forks as there is more leverage although how much weaker i still want to know

...no. That is completely the opposite of the truth. More fork in your bars = less chance of your bars breaking because of how much more surface area the impact is distributed to. I don't think the fork is affected the same way, I'm pretty sure the length of the fork has no effect on its strength.
 

instinctscooter

Silver Member
...no. That is completely the opposite of the truth. More fork in your bars = less chance of your bars breaking because of how much more surface area the impact is distributed to. I don't think the fork is affected the same way, I'm pretty sure the length of the fork has no effect on its strength.

the fork wont be in my bars at all though as its scs? and shorter bars are less likley to break at the down tube just like skinny bars are less likeley to bend at the crossbar right?
 

R-Dubya

Steel Member
Oh, for some reason I assumed you were talking about HIC. And yes, that's true. Taller and wider bars create more leverage under impact than smaller, narrower bars.
 

R-Dubya

Steel Member
but spacers = more fork leverage right?

No, the fork has no leverage in this scenario. You aren't applying force to the fork, you're applying force to the bars, which in turn puts force on the fork through leverage. The length of the fork and/or the amount of the fork being clamped has no effect, you're still transferring the same amount of energy to the same area of the fork.
 

instinctscooter

Silver Member
No, the fork has no leverage in this scenario. You aren't applying force to the fork, you're applying force to the bars, which in turn puts force on the fork through leverage. The length of the fork and/or the amount of the fork being clamped has no effect, you're still transferring the same amount of energy to the same area of the fork.

i was thinking of the impact from your feet on the deck traveling through the headtube and onto the fork having more leverage, also i wasnt sure if there would be more leverage and also when you pull back or push down on the non 90 degree angle it causes more stress as it can bend more easily and bend permanantley? dont know if that makes sense to you
 

Dom Marconi

Silver Member
It doesn't affect the strength.

it's the distance between the grips and fork that affect strength. Since it's making your bars taller, then yes, it will be weaker than riding the same bars without the spacers.

If you had smaller bars with spacers, or bigger bars with no spacers, they will be the same strength. It's not about whether there are spacers, it's just about height.
 
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