29er fork on 27.5 frame/wheels

PB Forum :: Freeride & Slopestyle
29er fork on 27.5 frame/wheels
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Posted: Nov 23, 2017 at 12:38 Quote
Im looking to hear the issues with putting a 29er fork on my 27.5 Bronson frame. Any thoughts on it?

Posted: Dec 5, 2019 at 8:47 Quote
Do it...mullett geo works...did it on a troy...awesome

Posted: Dec 5, 2019 at 9:09 Quote
If you maintain the travel:

• The front end will rise ~40 mm (difference in axle-to-crown and wheel radius)
• Head-tube and seat-tube angles will become ~2° slacker
• Reach will decrease by ~20 mm
• Trail will increase by ~20%
• BB height will increase by ~15 mm

It's essentially a new bike, which you may or may not like. Consider using a fork with 10 mm less travel to reduce the geometry changes a bit.

Posted: Dec 6, 2019 at 9:00 Quote
I’m running an NS eccentric 27.5 evo with a 120mm 29er pike , the axle to crown is within 2mm or so of a 140mm 27.5 pike. Essentially just missing 20mm of travel with same geometry

Posted: Dec 6, 2019 at 11:18 Quote
Tacocat13 wrote:
I’m running an NS eccentric 27.5 evo with a 120mm 29er pike , the axle to crown is within 2mm or so of a 140mm 27.5 pike. Essentially just missing 20mm of travel with same geometry

That's not correct. The axle-to-crown may be the same, but what about below the axle - i.e. the other half of the wheel? The 29er is larger. You forgot half of the calculation!

Posted: Dec 6, 2019 at 17:04 Quote
R-M-R wrote:
Tacocat13 wrote:
I’m running an NS eccentric 27.5 evo with a 120mm 29er pike , the axle to crown is within 2mm or so of a 140mm 27.5 pike. Essentially just missing 20mm of travel with same geometry

That's not correct. The axle-to-crown may be the same, but what about below the axle - i.e. the other half of the wheel? The 29er is larger. You forgot half of the calculation!
I running a 27.5 wheel.

Posted: Dec 6, 2019 at 21:17 Quote
Tacocat13 wrote:
I running a 27.5 wheel.

29er fork with 27.5 wheel? If so, then you're correct the matching axle-to-crown means you've maintained your static geometry, but your dynamic geometry is different. For example, 50% travel is now 10 mm higher and full compression is 20 mm higher.

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