Shimano UN55 73mm Shell English Thread Sealed Cartridge Taper Bottom Bracket

£24.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
- A good quality bottom bracket for traditional chainsets
- Super-accurate bearings for smooth operation and improved durability
- Durable, hard-wearing sealed cartridge bottom bracket with square tapered spindle fitting
- Lightweight hollow spindle
- Maintenance-free sealed cartridge bearing assembly keeps out dirt, mud, and water for long bearing life
- Fast and easy installation without adjustment
- Narrow body allows clearance for cable routing under the bottom bracket

Requires a Shimano type splined bottom bracket removal tool. (Shimano's own is SJSC part #858)
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Questions & Answers (4)
Does this work with Thorn 104/65 BCD triple crank to make 57mm chain line with rohloff
14 Mar 2020
I am building a Surly Troll/Rohloff touring bike. The Frame requires 73mm BB. If I use the Shimano UN55 110mm BB and the Thorn triple crank with the chainring in the outermost position will this give me a chainline of 57mm, or close to that?
110mm bracket required to get a 54mm chainline on middle ring,so yes outer ring will be pretty close if not 57mm.

Thanks - 16/03/20
I was looking to fit this to a 2015 Whyte 802 any idea what size I need?
30 Oct 2019
Hi, sorry without taking the old bottom bracket out we can't identify the length you need. Thanks
Club Tour Bottom Bracket size.
14 Jan 2018
I have a early Thorn club tour , 20 years old perhaps, with a Shimano triple chain set.
What size bottom bracket do l need ?
Kind Regards John .
Hi there,

If your chainset is a Shimano Exage, it should be a 68x113mm width.

Bottom Bracket Nondrive Side Cups For Bbun55
20 Sep 2014
does this part come with a nondrive side cup.. is it plastic or metal.. can I use the metal nondrive side cups you supply for the UN54 bottom bracket

Yes, as shown in the second picture this bottom bracket comes with a non-drive side cup, it is a metal cup. The UN54 only comes with a plastic non-drive side cup.