The Bottom Bracket Gauge Tool was designed to provide all the necessary measurements to identify the proper bottom bracket for a specific bike configuration. The gauge can measure:
bottom bracket width
bottom bracket shell inner diameter
crank spindle length
crank spindle diameter
bearing inner diameter
A metric scale runs along the long edges for measuring bottom bracket shell width and crank spindle lengths. Durable red anodized aluminum with laser etching. Overall size 7" x 3" x 0.125".