Fork Length & Trail Calculator
"If It Ain't Long It's Wrong"...Sugar Bear
We're going to make it easy for you to do the calculations for fork length and trail when you go to order your expensive billet front end to put on that equally expensive custom frame. Harley-Davidson screwed the pooch with their butt ugly Rocker fat-tired bike. Roll your own, become a "Master Builder"...Keep the economy grinding along by spending all your hard earned coin on these ego-centric toys. Hey, they build them in one hour on TV!!!
We know you were day dreaming about sex when the triangles were floating about the blackboard, or for those of you who were already warped, you were doodling motorcycles while the teacher droned on about sines, cosines, tangents. Now all these years later, when your brain cells are half-pissed away, all you have to do is make a few simple measurements and we'll help you figure out the fork length and trail.
If you are clever you can use the calculator to help you figure out what the other variables should be if you have a specific front end in mind and are building a frame.
Your front suspension geometry is defined by the following six variables which are defined as:
Harley Fork Length and Trail Calculator