Rake and Trail To reduce the trail, the front axle is often off-set from the line throug...

Rake and Trail To reduce the trail, the front axle is often off-set from the line through the steering head. The amount of off-set is the rake. See the accompanying figure. On this author's Trek 420 bicycle the rake is 5 centimeters, the head angle is 70°, and the diameter of the wheel is 700 millimeters. Find the trail in inches.