190mm fork on a 170mm frame

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Rolandpropain

Posted: May 17, 2022 at 11:24

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I have a 2018 propain tyee bike,I recently bought a 190mm zeb,propain says the bike is aproved with a 170 mm fork,but I watched a video and they said it’s not going to be a problem if I buy a fork with extra 20mm of travel,but I just discovered that propain says:”a fork length of more than 564mm must not be used as it leads to forces on the frame for which it was not aproved” the 190mm zeb is 606mm which is 4cm more than the aproved length,but the bike with the 190mm fork feels good,I like it this way better,it’s stable and didn’t messed up the geometry,but I’m worried it will snap the frame,should i leave it on 190mm,or should I chance the travel?

fourfourone

Posted: May 17, 2022 at 11:31	Quote
You should listen to what the manufacturer says.

Rolandpropain

Posted: May 17, 2022 at 12:16

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fourfourone wrote:

You should listen to what the manufacturer says.

the manufacturer says its made for 170 forks, if i change my forks travel to 170,the forks axel to crown length woud be 574 wich is still 1cm over the aproved length,but thanks for responding

Loyalty

Posted: May 17, 2022 at 12:24	Quote
From memory the 2018 propain tyee was 27.5 only. The a2c of a lyrik from that year is 562mm so within the stated tolerance. I’d say the Zeb isn’t compatible unfortunately.

Loyalty

Posted: May 17, 2022 at 12:25	Quote
That was 27.5 Lyrik at 170mm

Rolandpropain

Posted: May 17, 2022 at 12:30

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Loyalty wrote:

That was 27.5 Lyrik at 170mm

i bought a 27,5 zeb,i saw peoples using this frame with the zeb,but not the 190 version

Rolandpropain

Posted: May 17, 2022 at 12:35	Quote
I should add my old fork was a fox fork and the axel to trown length was 574(170mm of travel),what’s worked well,that fox fork had a 44 offset,this one only has a 38 which places the wheel almost te same place as the fox fork whit 44 offset,so I don’t think it will damage my frame(at least I hope so)

Danzzz88

Posted: May 17, 2022 at 12:59	Quote
Still not as bad as that guy that wanted to fit a set of dual crowns to a mid 2000s XC bike in that other thread.....

fourfourone

Posted: May 17, 2022 at 13:08	Quote
It sounds like you are going to ignore the advice you asked for and do it anyway... why even make the post if your just going to go against everyones opion to make yourself feel better about over forking a bike that is not designed for it.

mtbtrekracer

Posted: May 17, 2022 at 13:30	Quote
the others are right in this thread.. you should NOT do this. put the correct fork on it, they wouldnt say max measurements for no reason But hey, if you do - record it for friday fails for us.

Danzzz88

Posted: May 17, 2022 at 13:40

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I do think in reality it most likely won't be a problem, but companies have to cover their backs. I mean compared to the hole length of the lever from ground contact patch to headtube we are probably talking a few percent extra force. But still I wouldn't do it, I've had chainstays snap on me before just doing trail riding so even though they should not all manufacturers engineer in enough extra headroom from a structural integrity perspective. The choice is the OP's but usually if something isn't advised it's for good reason...the headtube is the very last place you want to snap.

Rolandpropain

Posted: May 17, 2022 at 22:17

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So,here’s some update,I was looking at the wrong zeb,the 29 er zeb has a 606 axel to crown length,mine (27,5) has 584 a2c length,what’s still 2cm longer than recomended,but I will buy a 180 airspring,what will make the a2c to 574 which will be 1 cm over the allowed length but I will take the risk or maybe I will leave it on 190,because I like it more,but that will depend after my 180 airshaft will arrive,thank you for replying,you guys made me think more and do more research,I even wrote a letter to propain,and I think it’s not going to be a problem if I keep rideing the 190mm(584 a2c),thanks!

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