Shimano's BB-UN55 Square Spindle Bottom Brackets are the unofficial standard for English-threaded cartridge bottom brackets. Quality, value, and durability come together to keep you cranking for many, many miles.
- Fits JIS Square-Taper Cranksets
- Hollow spindle
- Crankarm fixing bolts not included
|73 x 118mm||689228778733||EBBUN55C18||BBS23793654M|
|73 x 122.5mm||689228778863||EBBUN55C22||BBS23366684M|
|68 x 122.5mm||689228778870||EBBUN55B22||BBS23113437M|