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La Grange General Store & Backyard Bikes

Shimano UN55 Square Taper English Threaded Bottom Bracket

Shimano UN55 Square Taper English Threaded Bottom Bracket
Square Taper
Please select options
This item can be purchased online and picked up at your convenience.


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

Part Numbers

Option UPC MPN
107mm / English / Square Taper / 70mm 689228778788 EBBUN55I07
107mm / English / Square Taper / 73mm 689228778726 EBBUN55C07
110mm / English / Square Taper / 70mm 689228778771 EBBUN55I10
113mm / English / Square Taper / 73mm 689228778740 EBBUN55C13
118mm / English / Square Taper / 68mm 689228778795 EBBUN55B18
118mm / English / Square Taper / 70mm 689228778849 EBBUN55I18
122.5mm / English / Square Taper / 70mm 689228778832 EBBUN55I22