I have a "belt checker" from MCM electronics. You place the belt around one pin, then slid the other pin until the belt is sitting between them with no tension. It tells you the size of the belt. Then there is a ruler to measure the width, and a picture chart that shows style (square, round, whatever). When you have all the info, there is a chart on the back with MCM part numbers for the matching belt.... only down side... more often then not, they no longer carry the part listed on their checker... and they don't seem to have a list of compatible parts they DO carry... fortunalty, their master catalog has a list of belts and tires by size. -chris <http://www.mythtech.net>