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
|113mm / English / Square Taper / 68mm||689228778757||EBBUN55B13||210000045967|
|118mm / English / Square Taper / 73mm||689228778733||EBBUN55C18||210000045972|