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Shimano BB UN55 bottom bracket British thread 68 x 122.5

5.0 out of 5 stars 2 customer reviews

Price: £16.99
Only 10 left in stock - order soon.
Dispatched from and sold by Dennis Winter leven ltd.
3 new from £16.99
  • 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

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£16.99 Only 10 left in stock - order soon. Dispatched from and sold by Dennis Winter leven ltd.

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Product details

  • Product Dimensions: 14 x 6.4 x 5.1 cm ; 295 g
  • Boxed-product Weight: 408 g
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
    Find out more about our Delivery Rates and Returns Policy
  • Item model number: EBBUN55B22
  • ASIN: B005DTIEZQ
  • Date first available at Amazon.co.uk: 15 Nov. 2011
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (2 customer reviews)
  • Amazon Bestsellers Rank: 142,882 in Sports & Outdoors (See Top 100 in Sports & Outdoors)

Product Description

Fast and easy installation without adjustment Narrow body allows clearance for cable routing under the bottom bracket


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Customer Reviews

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Top Customer Reviews

Verified Purchase
My bottom bracket on my old Raleigh had given up the ghost after many years of faithful service. After looking round at all sorts of replacements and being totally confused by all the different types and sizes, I chose this one because the screw-in part that fits the left side was alloy, not plastic as a lot of them seem to be. After removing the old, loose ball-bearing one I fitted the new one and it fitted like a dream! The hardest part was remembering which bit had a left-hand thread! Total time taken for the job was about thirty minutes, including resetting the front mech. As another reviewer commented, it's not frictionless, but it's 100% better than my old one and seems to be getting better the more I use it. There are cheaper BBs out there and some dearer ones too, but I'm very pleased with this model and I'm looking forward to many more years use out of my old Raleigh now.
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Verified Purchase
I replaced the half-open standard bearing arrangement with this sealed unit. I had quite some trouble working out which sealed unit would work in this bike.

This product has replaced the standard component and has been running for many hundreds of miles. The pedals operate appreciably more smoothly. All issues of play and noise have been eliminated.
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Most Helpful Customer Reviews on Amazon.com (beta)

Amazon.com: HASH(0x8f5f16f0) out of 5 stars 302 reviews
55 of 57 people found the following review helpful
HASH(0x90e909c0) out of 5 stars Good part for a great price 26 Feb. 2012
By D. Kellan - Published on Amazon.com
I noticed some popping and cracking on my Redline Monocog a few months after I bought it. Turns out the bottom bracket was bad, seems to be common with that bike. Never replaced a bottom bracket before, so I checked out the videos on youtube, saw it wasn't too hard, bought this bottom bracket and the Park tools from Amazon.com and did the work myself. Seriously, it took less than an hour total. If you have any doubts whatsoever about this part, just look up the how to videos on youtube and rest assured you CAN replace your own BB. The UN55 works great, is smooth and was easy to install. Now my bike rides better than it did brand new. I've had it for about 6 months now and it's still working fine. If you are unsure about the exact size of your BB, use Sheldon Brown's web page and there's a handy reference sheet. Also the spec sheet will list it online if you websearch your bike model. Or you can do what I did, and use a crank puller (amazon.com) and pull off your cranks, then use the BB tool (amazon.com) to remove your old defective BB and see what's printed on the side of it. I think I paid less than $20 for this part, and it works so well it will most likely migrate to my next commuter bike as well.
29 of 30 people found the following review helpful
HASH(0x8fd19984) out of 5 stars Shimano UN55 11 Feb. 2012
By Ian - Published on Amazon.com
Verified Purchase
I purchased this BB for my old 80s Fuji when the old loose bearing one started having some issues. I was very hesitant to switch to the newer cartridge after hearing mixed reviews on them, but since I ride this bike in all weather to and from work I liked the idea of having a sealed bearing you don't have to re-grease. Once I measured the old BB closely I decided on the UN55 over the UN54 because it has all aluminum parts. After installing I have been extremely satisfied. It is very smooth and much cheaper than the ones at my LBS. I would certainly purchase this item again.
26 of 27 people found the following review helpful
HASH(0x90e92558) out of 5 stars Works great. 9 Aug. 2012
By Joseph Lee - Published on Amazon.com
Verified Purchase
I'm a big guy and I'm no spinner. I use big gears as I stand up and use my 220 lbs. to climb the hills in San Francisco so I'm hard on BBs. I've put about 400 miles on this one with no squeaks, creaks or groans. I'm happy.
25 of 31 people found the following review helpful
HASH(0x90e90c9c) out of 5 stars Good stuff 27 Oct. 2011
By vegassubscribe - Published on Amazon.com
Verified Purchase
Went for the UN55 over the UN54 for the all aluminum parts. Smooth as butta and dirt cheap, feels like a new bike. Never changed a bottom bracket before and the instructions say to grease the threads, which seemed screwy to me, but I did it anyway and sure enough they work their way out on the first ride. I removed the grease and reinstalled. No other problems so far. You will also need the Park Tool Crank Puller - CCP-22 and Park Tool BBT-22 Shimano Sealed Cartridge Bottom Bracket Tool.
7 of 7 people found the following review helpful
HASH(0x90e90e1c) out of 5 stars No more crank creak! 16 Oct. 2013
By Kindle Customer - Published on Amazon.com
Verified Purchase
Creak started about a year ago on my commuter bike (bottom bracket only 2 years old), went away for periods, then back with a vengeance. Only creaked on light down-stroke of left side petal. I tried tightening and lubing many parts of the bike to no avail. Finally decided to pull the cranks and saw that the plastic cup was cracked. Pulled the UN54 bracket with plastic cup, installed the UN55 with aluminum cup, no more creak.
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