Steel bottom bracket shell - ISO threaded - 69mm - Made in USA

sku # BBS-US-ISO-69 Made from 4130 steel, these US made, lightweight 38.1mm (outer diameter) ISO BB shells are available in 69mm with an extra 1mm of width ensuring sufficient material for facing both sides. At the end of the facing process, they will then be 68mm. The drive side with the left hand thread is identified by a radial groove on the face of the shell. ISO aka BSA, BSC, BC, British, and Euro. Right and left hand threaded (ISO) 1.370" x 24tpi. Made in the USA. 99g - Weight is based on representative sample. Actual weight may vary slightly.