Most race stands will not work because the suspension will still be loaded by resting on the swingarm rather than the wheel. On bikes with sidestands the bike can usually be carefully rocked up on the stand to unload the suspension. Step 1: Extend the suspension completely by getting the wheel off the ground. We'll tell you why this occurs and how to handle it. If you've ever measured sag before, you may have noticed that if you check it three or four times, you can get three or four times, you can get three or four different numbers without changed anything. My company,Race Tech, 951.279.6655 has an advanced method of checking spring sag that I'll describe. It is also referred to as static ride height or static sag. Spring sag is the amount the springs compress between fully topped out and fully loaded with the rider on board in riding position. The first step to setting up any bike is to set the spring sag and determine if you have the correct-rate springs. Suspension tuning isn't rocket science, and if you follow step-by-step procedures you can make remarkable improvements in your bike's handling characteristics. It will feel generally sluggish and clumsy.What's with all this ruckus about suspension these days? It seems everyone is clued in that suspension setup can be a key to riding fast and safely, but how do you do it? No matter what shock or fork you have, they all require proper adjustment to work to their maximum potential. 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. 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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