Standard and metric gauges to check sheave wear. Sheave condition and alignment are vital to v-belt life and performance. New v-belts should never be installed without a thorough inspection of the sheaves. Particular attention should be given to wobbling sheaves, a shiny groove bottom and worn groove sidewalls. Use the Sheave Gauge to accurately check grooves for wear. A flashlight held behind the template, when placed in the groove, will help you observe the amount of wear. Wear should not exceed 1/32 in for individual v-belt drives and 1/64 in for banded belt drives. Sheave Gauges are based upon the standards for classical belts from the association for rubber products manufacturers ARPM IP-20, wedge belts ARPM IP-22 and metric belts ISO 4183. Timken Belts Sheave Gauge, Metric, For Use With: Individual V-Belt Drives and Banded Belt Drives