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Fork Rake question.(3 posts)

Fork Rake question.Juanmoretime
Feb 5, 2003 5:50 AM
I want to keep my wheel base as short as possible, toe overlap is not an issue, would I want a 45 or 40 rake angle? Thanks for the help!
40 would give you less rake and shorter wheelbase...Quack
Feb 5, 2003 6:08 AM
It would help to know what the factory spec'd for forks on your frame and go from there. Personally, I would run exactly what the engineers spec'd. They designed the bike to have certain ride characteristics so that you don't endo on every big pothole that you hit.

Good luck!
wrong approach....C-40
Feb 5, 2003 8:00 AM
Changing the fork rake is not the way to reduce the wheelbase. Rake is measured in millimeters, not degrees.

Changing the rake affects the amount of trail, which is the important value to consider.

If you want the bike to steer more quickly you want more rake than you have now. Reducing the rake will make it steer more slowly.

To make an informed decision, post your frame size and headt tube angle.

The formula for trail is (R/tanH) - (rake/sinH). For example, a 73 degree head tube angle (H) and and a 45mm rake will produce a trail of 55.7mm with a 336mm tire radius (R). Less rake would increase the trail and slow the steering a bit, despite the fact that the wheelbase was slightly reduced.