Nouveau support inférieur fil anglais Shimano SM-BBR60 TL-FC25 BSA Ultegra 105
The new design also reduces friction by 50% compared to a 6700 bottom bracket by improving upon the seal design. Shimano SM-BBR60 (BSA) Bottom Bracket. BSA (1.37 x 24), 68mm. 1 x Shimano SM-BBR60 (BSA) Bottom Bracket.