Give me the facts on 27.5 and 29er forks!

PB Forum :: 27.5/650b
Give me the facts on 27.5 and 29er forks!
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flag benmrhardtail
Posted: Jan 8, 2021 at 7:09 Quote
Ok Gang this is something I have wondered about for years now and it seems no one can give me the straight goods
without going off topic.

I have two forks. We will say 2020 factory fox 36 grip 2. both forks are set at 160mm of travel. Say my bike is a 27.5 and Im running 27.5 wheels "not 29 inch" would running a 29er fork change the geo?

basically wondering if the only difference is the axle to wheel arch? Or is there much more going on?

cheers!

ps try to post only if you acutely know. I ton of people just assume.

Cheers and happy riding!!!!
flag rahrider
O+
Posted: Jan 10, 2021 at 0:03 Quote
I looked into this when I mulleted my Evil Insurgent.

The fork lowers are about 20mm longer so the axle to crown lengthens that much. In addition the bigger wheel raises the front axle about 19mm or something like that (622-584 divided by 2 for radius).
flag Aptlynamed
Posted: Jan 10, 2021 at 1:01 Quote
Although the axle to crown length of 27'' forks is generally longer than 29'' forks, the amount differs a bit from brand to brand. Look up the exact axle to crown length on the manufacturers website.
flag benmrhardtail
Posted: Jan 10, 2021 at 7:07 Quote
rahrider wrote:
I looked into this when I mulleted my Evil Insurgent.

The fork lowers are about 20mm longer so the axle to crown lengthens that much. In addition the bigger wheel raises the front axle about 19mm or something like that (622-584 divided by 2 for radius).


Much appreciate the reply! Thank you!
flag 5piggies
O+
Posted: Mar 30, 2022 at 18:38 Quote
I just looked at the fox drawings and theres 17.4mm difference from the axle to the lower bearing race.
flag Elbarto14
Posted: Dec 27, 2022 at 19:41 Quote
Fact: if you put a 27.5 wheel into a 29 fork it will still spin hence the bike will still roll! who would have thought
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