Niner 29er carbon fork on 650b frame

[fffuhq]

Hey all,

I might be a dufus here but was wondering if it would be a bad idea to put a niner 29er carbon fork on a 650b/27.5 frame. would it feel and look really goofy? Thanks in advanced.:o sorry if this subject was already touched.

[mgordon]

You should check the axle-to-crown length on the fork that is intended to come with the bike, and the fork you're thinking about. That will make the biggest difference in how the bike feels.

[fffuhq]

Thank you. Itll be a ritchey p-650b frame. I just had an additional fork not in use but looks to be better to buy a 27.5 fork.

[DRietz]

It will more than likely substantially slack your HTA, which will definitely alter the bike's ride. Only you get to decide how you like it.

[Ken C]

The Ritchey 650b fork has an axel to crown of 459mm and a 42mm rake.

The Niner fork has an axel to crown of 470 with a 45mm rake.

I think it would roughly slacken the HTA from 70 degrees to ~ 69.5 degrees and the STA from 73.5 degrees to ~70 degrees.

The other variable will be that it will also raise the BB, but I don't think it would be that much of a change. The only way is to try it and see if you like it.

I have a Soma B Side V1 which is a 650b that has a 71.5 degree HTA, 73 STA, and 50mm BB drop with the original rigid fork (453mm axel to crown and 43mm rake). I wanted to fit a 2.5in 27.5 WTB Breakout on the front and needed more fork clearance so I changed the fork to a Salsa Cromoto Grande 29er fork with an axel to crown of 468mm and a 45mm rake.

I really like how my bike handles now. It is hard to say if it is due solely to the fork change or combined with changing the front tire from a 2.3 Vigilante to the 2.5 Breakout. I am not a geometry expert by any imagination, I just figured I would try it and now I love it. YMMV and all but, I would try it first since you already have the Niner Fork.

[p nut]

People have put the Niner fork on 26" frames, so it shouldn't be an issue at all, or look goofy. As Ken C laid out above, difference is minimal, if at all. I'm sure it would be a fun bike.

[fffuhq]

The Ritchey 650b fork has an axel to crown of 459mm and a 42mm rake.

The Niner fork has an axel to crown of 470 with a 45mm rake.

I think it would roughly slacken the HTA from 70 degrees to ~ 69.5 degrees and the STA from 73.5 degrees to ~70 degrees.

The other variable will be that it will also raise the BB, but I don't think it would be that much of a change. The only way is to try it and see if you like it.

I have a Soma B Side V1 which is a 650b that has a 71.5 degree HTA, 73 STA, and 50mm BB drop with the original rigid fork (453mm axel to crown and 43mm rake). I wanted to fit a 2.5in 27.5 WTB Breakout on the front and needed more fork clearance so I changed the fork to a Salsa Cromoto Grande 29er fork with an axel to crown of 468mm and a 45mm rake.

I really like how my bike handles now. It is hard to say if it is due solely to the fork change or combined with changing the front tire from a 2.3 Vigilante to the 2.5 Breakout. I am not a geometry expert by any imagination, I just figured I would try it and now I love it. YMMV and all but, I would try it first since you already have the Niner Fork.

Thank you. I will give it a shot. I will also look for a 27.5 suspension fork in the time being.

[mgordon]

Are you planning to use a 650b wheel in the 29er fork? I'd say it's worth giving it a shot if you already have the fork.

[fffuhq]

Are you planning to use a 650b wheel in the 29er fork? I'd say it's worth giving it a shot if you already have the fork.

Yeah ill be running a 650b wheel