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||CR5408|
|68 x 115mm||689228778894||EBBUN55B15||CR5403|