Shimano Ultegra SM-BR60B Threaded Bottom BracketSet of BSA threaded cups required for mounting 24mm diameter Hollow Tech cranks on frames with 68mm wide bottom bracket and English thread.Also available in a version for Italian screw boxes. Shimano Ultegra SM-BR60B Threaded Bottom BracketSet of BSA threaded cups required for mounting 24mm diameter Hollow Tech cranks on frames with 68mm wide bottom bracket and English thread.Also available in a version for Italian screw boxes.