The mysterious "Rick" of Anytown, USA asked:
> Does anybody know how to calculate trail?
Not sure if it's really on topic -- but what the heck, they did calculate trail back then...
Anvil Bikeworks has an Excel spreadsheet you can download at
http://anvilbikes.com/
Or just whip out your trig tables and calculate it yourself with: Trail = W/tan(H)-R/sin(H) Where W = wheel radius (hub axle center to the ground), H = Head Tube Angle, and R = rake
Wheel radius should ideally be measured with your weight on the bike, thus it varies with tire pressure - but nobody needs to know their trail that accurately. It's just not that sensitive.
Mark Bulgier
Seattle WA USA