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Shimano UN55 Square Taper English Threaded Bottom Bracket

Shimano UN55 Square Taper English Threaded Bottom Bracket
Square Taper
Please select options


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 Store SKU
107mm / English / Square Taper / 73mm 689228778726 EBBUN55C07 BBS23177418M
107mm / Italian / Square Taper / 70mm 689228778788 EBBUN55I07 SHI50112194T
110mm / English / Square Taper / 73mm 689228778825 EBBUN55C10 BBS23166291M
113mm / English / Square Taper / 73mm 689228778740 EBBUN55C13 BBS23622417M
110mm / Italian / Square Taper / 70mm 689228778771 EBBUN55I10 SHI50594677T
113mm / Italian / Square Taper / 70mm 689228778856 EBBUN55I13 SHI50962393T
118mm / Italian / Square Taper / 70mm 689228778849 EBBUN55I18 SHI50578224T