The Park Tool SBC1 Spoke, Bearing and Cotter Gauge is a handy shop aid and is ideal for sizing spokes, ball bearings and crank cotters. To use, just hang the head of the spoke in the oblong hole and read its length on the scale. For crank cotters and ball bearings it works just like a gauge for drill bits. Spoke lengths are in both metric and fractional markings. Made of anodized aluminium with embossed markings to allow easy reading and long life.
Best Price: £9.34 from Tweeks Cycles