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About this product
Product Identifiers
BrandShimano
MPNEBBUN55B13
GTIN0689228778757
UPC0689228778757
eBay Product ID (ePID)1600720279
Product Key Features
Spindle TypeSquare Taper - JIS
Shell Width68 mm
ColorSilver
Bottom Bracket Shell TypeBSA (English)
Compatible Bike TypeCyclocross Bike, Mountain Bike, Touring Bike, Tandem Bike, Universal, Hybrid Bike, Road Bike, Dirt Jumper, Racing Bike
MaterialAluminum, Steel
ModelBB-UN55
Dimensions
Item HeightEnglish 68mm x 113mm
Item Weight330 g
Ratings and reviews
Most relevant reviews
- 10 Dec, 2019
Foolproof - easy to install
This model, with the two steel retention cups, is the way to go. You do need the tool to install/de-install it, but there is no adjustment necessary. Spindle length is crucial, so compare to the bottom bracket spindle you are replacing. An incorrect spindle length throws off your chainline and can make shifting on the chainrings difficult if not impossible.Verified purchase: YesCondition: New
- 04 Feb, 2021
Pedals smoothly
Double check your measurements - I got the right diameter but this was a size a bit too narrow but luckily my local bike shop got new crank screws that made up the difference. Aside from that, works smoothly and haven't had any issues.Verified purchase: YesCondition: New
- 23 Aug, 2016
Smooth as silk
A bit heavy side but all metal construction makes it work. A cheaper version of it has plastic cups. And gets rid of that strange noise when pedaling. You feel like bike is pedaling for u. Nice upgrade from stock open bearings. But u really need to know what's ur bb size is. ?? x ??? and Eng or not is extremely important.Verified purchase: YesCondition: New
- 10 Jun, 2020
What's in your bicycle bb hole?
Excellent quality. = Shimano Quality A reliable solution for a world deprived of regular LBS hours. A viable solution should one be stranded at the end of the world, very much unlike someone who has a pressed bb!Verified purchase: YesCondition: New
- 11 Dec, 2016
Excellent upgrade!!
Rebuilding my early 90s mountain bike. The factory cartridge finally gave up on me. I installed this replacement cartridge and have been enjoying it ever since.. It's easy to install and has an all aluminum construction ( No plastic sides). If this is your first time be sure to by the tool to install it.. Good luck!!!Verified purchase: YesCondition: New
- 11 Apr, 2019
great quality from shimano
The shimano un55 is an extremely well made workhorse of a bottom bracket. It is not the lightest or most modern technology but it is very durable and works flawlessly. Installation is a breeze. You can't go wrong with this bb.Verified purchase: YesCondition: Pre-owned
- 26 Apr, 2018
It works just fine
If you are using an old square taper crankset and you are tired of cleaning and relubricating your old BB, then this is a great option. It works fine, but not really any better than a well-maintained non-sealed BB. Four stars just because it is old tech and heavy.Verified purchase: YesCondition: New
- 15 Jul, 2019
Perfect fitment on a '96 Trek 850
Perfect fitment on a '96 Trek 850, This Shimano 68x113 BB-UN55 is a direct replacement for the 23 year old BB-LP25! 113mm width is spot on vs: the old bottom bracket, weight is about the same. Smooth as silk! Lovin' my Trek resto-mod!!!Verified purchase: YesCondition: New
- 01 Apr, 2019
Quality parts make for a quality cycling experience.
Great way to revitalize an old bike. Easy to install with the proper bicycle tools. Makes pedaling easier and bicycle quiet.Verified purchase: YesCondition: New
- 21 Jun, 2018
Must have upgrade
These are great upgrades for older bikes. So easy to do. Super smooth. These are staples for my old bike projects.Verified purchase: YesCondition: New
