![]() Note: If your bike is equipped with a rear suspension, have someone sit on the seat when you make the measurements to simulate your actual riding condition. Now measure the distance between the two marks and you have your trail measurement. Then place the tape parallel to the steering neck, following the angle of the steering neck all the way up to the floor. Raise the bike to an upright position, using a tape measure, hold the tape straight down from the front axle to the floor. ![]() Usually adjustable in 3, 5, 7 degrees of rake. RAKED TRIPLE TREES: In order to bring trail figures back into line, triple trees with raked steering stems can be used. TRAIL: The distance defined by the vertical line from axle to ground and the intersection of centerline of the steering neck and ground. RAKE: The angle in degrees of the steering neck from vertical.įORK LENGTH: The distance between the top of the fork tubes to the centerline of the axle.ĭIAMETER: The diameter of the front tire. OFFSET: Centerline of the top steering neck to the centerline of the top of the fork tubes. Your front suspension geometry is defined by the following six variables which are: It might explain why shopping carts weren’t meant to go 200 mph. We’re going to show you how to do the calculations. Now all these years later when you finally got the money to build your dream bike, all you can do is thumb through pictures of other people’s projects, searching for that “look” blissfully unaware of what all that trigonometry was for. We know you were day dreaming about sex when the triangles were floating around the blackboard and you were doodling motorcycles while the teacher was explaining geometry and tangents.
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