Park Tool Spoke/bear/cotter Gauge SBC-1

SAE markings from 0-12.25 inches

Metric markings from 0-310 millimeters

Gauges for 1/4", 7/32", 3/16", 5/32" and 1/8" ball bearings

Gauges for 8, 8.5, 9, and 9.5 mm crank cotters

About Park Tool
Park Tool are the world's largest bicycle tool manufacturer. Located in St. Paul Minnesota they have been designing and manufacturing bicycle specific tools since 1963. Their dedication to quality and innovation have gained them the reputation for producing the best bicycle tools in the world.