SVXR650

The stock piece progressively increases resistance to bottoming out... Suzuki does this to run a soft shock spring for a comfortable ride... And avoid bottoming out if you ride with a passenger...

When you upgrade your rear suspension, the stock linkage makes the rear end work progressively harder... More than it is necessary...

This linkage is linear and the shock spring rate is the only thing that determinate movement... In other words the suspension works full range without additional resistance... Rear end absorbs imperfections of the road without unsettling the chassis...