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MountainBikeReview.com's Forum Archives - Singlespeed
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Oh on the geometry topic, the change in length that screws.. (1 post)
|  Oh on the geometry topic, the change in length that screws.. | DeeEight
Feb 17, 2002 7:25 PM | | angles by 1 degree, on a 42" wheelbase bike, is 0.71" of fork crown race to axle length. So that's 18mm. So if your bike's geometry is REALLY set by say, a 17" long fork (a lot of brands claim one thing and real measured numbers are something else, Jamis for example on all the Dakar models are off by 2 degrees - so invest in the $30 carpenter's angle protractor and measure your bikes!), then a 16" long rigid fork would STEEPEN the angles by about 1.4 degrees, while going to an 18" fork sends it 1.4 degrees slacker. Now the other thing that happens is you get a change in BB height also of about a 1/4" for ever .71" increase in fork length.
But also you can use tire size choices to affect your geometry too. Fatter tires tend to be taller in profile, so if you ran a fatter back tire than front, it'd raise the back of the bike slightly, and compensate for a taller fork. |
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