Originally Posted by dirtracin58

Motion ratio is usually defined as change in shock travel divided by change in wheel travel. The ratio changes throught the travel since the shocks are angled and the links all move on an arc so to simplify things you need to find one value that represents the entire travel. The change in shock travel for the entire travel is equal to the extended exposed shock shaft assuming the shock bottoming out limits travel. The change in wheel travel can be measured by measuring the difference in wheel travel when the shock is fully extended and when the shock is fully compressed. So if the shock is able to travel 1" and the wheel is able to travel 2" the motion ratio would be .50.