Vintage Shimano BB-UN72 Sealed Bottom Bracket 108mm 68mm JIS BSA 1.37×24 Japan

Vintage Shimano BB-UN72 sealed cartridge bottom bracket for BSA 68mm shells. Square taper JIS spindle with aluminum and steel construction in a silver and black finish. Cups are marked “BC 1.37×24” and “BC 1.37 68”, and the body label reads “Shimano BB-UN72 Japan PAT. PENDING”. Actual measurements: spindle length reading 107.95 mm on the digital caliper, weight 255 g on the scale. For frames using 68 mm English-thread (BSA) bottom bracket shells; suitable for many road, touring and MTB builds. Set includes the complete one-piece cartridge with integrated cups only; no crank bolts or additional small parts.