Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Understanding....rebound
Reply to thread
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
[QUOTE="ET, post: 24580, member: 21828"] SOG is right about this, but the book "The Racing motorcycle" has an overly complicated explanation. To find out what will happen to the rear suspension under acceleration, all you have to do is add up the forces that are trying to rotate the swingarm about its pivot point. In this case we have the chain force and the tire contact force. You find the perpendicular distance of the force from the pivot point and multiply it by the force to get the torque that will try to rotate the swingarm. For the chain, you just measure the distance from the center of the chain to the center of the pivot point. For the tire contact force ,on level ground, it is the distance from the ground to the center of the pivot point. We can't easily get the forces, but we can get the ratio of them, and that is the ratio of the sprocket diameter to the tire diameter. As an example, on my bike, the tire is 26" and the sprocket is 10" so the chain has 2.6X as much force as the tire contact patch. The chain is 2" from the pivot point, and the pivot point is 16" from the ground, so the tire contact force has 8 times as much leverage as the chain. You divide 8 by 2.6 to find that the tire contact force has 3 times as much effect as the chain force, so under acceleration the rear wheel will try to go down, which will make the rearend go up. This is one of the reasons you should get on the gas when landing from a jump, it will effectively stiffen the rear suspension. If the rear tire were trying to go over a basketball size rock, the tire contact force would be adding to the chain force in trying to raise the rear tire up and move the rear end down. [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Understanding....rebound
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom