Originally Posted by
Andrew R Stewart
A very close measurement of rake with the fork still on the bike is to measure from the BB shell to the ft axle (obviously the wheel has been removed...), write this amount down. Now spin the fork around 180*, so it's backwards. Remeasure from the shell to the axle and write that down. Add the two measurements and divide by 2.
ITYM subtract the smaller from the larger measurement, and divide that by two. That's a handy hack.