The JR Race Car 7/8" wide belt is designed for use on the Shockwave Overdrive clutch. Lower chugs on the belt allow it to be flexible and strong.
 
Several centers are available for the 7/8" line of belts.
 
SKU                          CENTRE DISTANCE*
545-78783                       8 1/16"
545-78784                       8 1/2"
545-78785                       9 1/8"
 
*** Centers: The the distance from the center of crank shaft to center of jackshaft. (Measurements are approximated)