You will have trouble balancing the bike at lower speeds or on winding roads. If the trail is more than 6 inches the bike will handle sluggishly at high speeds. If you use a very fat rear tire, you should keep the trail as close to 4 inches as possible. Flowing smoothly through curves without swaying or wobbling. The bike will handle easily at both high and low speeds. Normal trail is somewhere between 3 and 6 inches. It will easily develop a fatal high-speed wobble. With too little or negative trail (steering axle mark behind the front axle mark), the bike will handle with unbelievable ease at low speeds, but will be completely out of balance at high speed. 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. Rigid Wishbone Style Frame - Harley-Davidson Evo Big Twin 1,436.35 1,511. Motorcycle Frame & Chassis Sort by SAVE 5 Kraft Tech Inc. Then place the tape parallel to the steering neck, following the angle of the steering neck all the way up to the floor. Motorcycle Frame & Chassis for Harley, Sportster, Chopper, Bobber and more - Lowbrow Customs Home Motorcycle Frame & Chassis Brand Kraft Tech Inc. 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.
#Chopper motorcycle frame how to#
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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