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Shimano UN55 Square Taper English Threaded Bottom Bracket

Shimano UN55 Square Taper English Threaded Bottom Bracket
Length: Select length
Model: Select model
Width: Select width
Spindle: Square Taper
Please select options Unavailable
Sorry, this item is currently not in stock at one of our retail locations. Please call the store at (770) 422-5237 or email with any questions and to check availability on ordering this item for you.


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 / 73mm 689228778726 EBBUN55C07
107mm / Italian / Square Taper / 70mm 689228778788 EBBUN55I07
110mm / Italian / Square Taper / 70mm 689228778771 EBBUN55I10
113mm / English / Square Taper / 73mm 689228778740 EBBUN55C13
113mm / Italian / Square Taper / 70mm 689228778856 EBBUN55I13
118mm / English / Square Taper / 73mm 689228778733 EBBUN55C18
118mm / Italian / Square Taper / 70mm 689228778849 EBBUN55I18
122.5mm / English / Square Taper / 68mm 689228778870 EBBUN55B22
122.5mm / Italian / Square Taper / 70mm 689228778832 EBBUN55I22