Geometry question
 

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Geometry question

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I have a 2017 orbea rallon with 27,5 wheels. I have been given opportunity to get Nice forks, but should i get 29 forks to use with my 27,5 wheel ?
Just in case i want to change the frame next year.


 
Posted : 14/06/2022 2:42 pm
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Will lift the front of your bike by an inch or more, which will be bad for lots of reasons (unless you get shorter travel 29er forks - say 130mm instead of 150mm)


 
Posted : 14/06/2022 2:44 pm
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Check the Axle-to-Crown measurement of your current forks vs the new forks.... 20mm difference will change the head angle by approx 1 degree (simple math), as well as raising/lowering the BB.


 
Posted : 14/06/2022 2:53 pm
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As above. I did this when I had a Cotic Rocket with 26" 150mm forks. I knew I planned on getting a 650b bike in the future so upgraded to 130mm 27.5" forks with the 26" wheels in.

Joke was on me though: I ended up going 29er so had to sell the forks after all.


 
Posted : 14/06/2022 4:44 pm
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I tried it on a Whyte G170, it was horrific


 
Posted : 14/06/2022 5:13 pm
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Thanks all, going to stick with 27,5.


 
Posted : 14/06/2022 7:35 pm
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IME, a 51mm offset 29" fork feels AWFUL on a 27.5" bike. Even if you match the Axle to crown measurement.
However a short offset 29er fork might feel OK, if you get the A-C close.


 
Posted : 17/06/2022 2:31 am
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If you're on a small frame you may get toe-overlap issues.


 
Posted : 17/06/2022 7:44 am
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The flip side is that I ran 140mm + 150mm forks on my Orange Segment which was designed for 120mm and it was fine.


 
Posted : 17/06/2022 10:05 am

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