From V Belts, Timing Belts, poly V belts and more. Some FAQS on Belts.
I have a V Belt but there are no markings on it. What Part do I need?
First check the Top Width and Height of the Belt. Please see the list and sizes below:
Z Section - 10mm x 6mm
A Section - 13mm x 8mm
B Section - 17mm x 11mm
C Section - 22mm x 14mm
D Section - 32mm x 19mm
Next measure the size of the belt on the Inside. So lets say you are getting an Inside Measurement of 26" and a Width and Height of 13mm and 8mm respectively.
You would need an A Section belt so an A26 V Belt is what you would choose. It's as easy as that.