Shimano UN55 Square Taper English Threaded Bottom Bracket - 2019

Shimano UN55 Square Taper English Threaded Bottom Bracket
$23.99 - $34.99
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Due to our dealer agreements, this item is not permitted to be shipped directly to you on orders placed online. However it can be purchased online and be picked up at one of our six convenient locations. Please have your Photo ID and the Credit Card you made the purchase on ready to verify your order.


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
68 x 107mm 689228778801 EBBUN55B07 BBS23997283M
70 x 113mm 689228778856 EBBUN55I13 SHI50680205T
70 x 118mm 689228778849 EBBUN55I18 SHI50862009T
70 x 122.5mm 689228778832 EBBUN55I22 SHI51886869T
73 x 107mm 689228778726 EBBUN55C07 BBS23910399M
73 x 110mm 689228778825 EBBUN55C10 BBS23976348M
73 x 113mm 689228778740 EBBUN55C13 BBS2365704M
73 x 118mm 689228778733 EBBUN55C18 BBS23112837M
73 x 122.5mm 689228778863 EBBUN55C22 BBS23677946M
68 x 110mm 689228778887 EBBUN55B10 BBS23876141M
68 x 113mm 689228778757 EBBUN55B13 BBS23400651M
70 x 115mm 689228778818 EBBUN55I15
68 x 115mm 689228778894 EBBUN55B15 BBS23622037M
68 x 118mm 689228778795 EBBUN55B18 BBS2353018M
68 x 122.5mm 689228778870 EBBUN55B22 BBS2399549M
68 x 127mm 689228778764 EBBUN55B27 BBS23427653M
70 x 107mm 689228778788 EBBUN55I07 SHI50292711T
70 x 110mm 689228778771 EBBUN55I10 SHI50390540T