Shimano UN54 JIS Bottom Bracket
UN73 (XT/Ultegra-level) quality at a UN53 (LX/105-level) price. Traditional square JIS 2-degree taper crank-arm interface. Offered in either 68/73mm English (BC1.37 x 24tpi RH/LH) or 70mm Italian (M36 x 24tpi RH/RH) threads.
Item Specifications:
Size:
68mm
70mm
73mm
Length:
107mm
113mm
115mm
118mm
122mm
127mm