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Shimano Bottom Bracket BBUN55

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Product Description

A good quality bottom bracket for traditional chainsets.

Key Features:
  • 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

Occasionally, without notice, manufacturers change product design and/or specifications.

Shimano Bottom Bracket BBUN55 Reviews

Write your own review
Overall Rating:
4.8
out of 5
4.77
Build Quality
4.68
Performance
4.82
Value For Money
4.82

Customer Reviews (11)

4
Good bit of kit
by Anonymous user on 22/06/2020

I found the BB to be good value for money and very easy to fit. only time will tell about how long it lasts but it seem to perform well

I found the BB to be good value for money and very easy to fit. only time will tell about how long it lasts but it seem to perform well

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4.5 out of 5
Build Quality: 4.5/5
Performance: 4.5/5
Value For Money: 4.5/5
5
Quality Item
by Anonymous user on 11/06/2020

Genuine Shimano replacement bottom bracket bearing. Bike is noticeably smoother after changing the (17yr) old bearing. Fairly easy job but you will need a couple of special tools (see YouTube). On this unit, the retainer on the non-drive side is aluminium. This seems to work well, and hopefully that won't cause problems the next time I need to change it.

Genuine Shimano replacement bottom bracket bearing. Bike is noticeably smoother after changing the (17yr) old bearing. Fairly easy job but you will need a couple of special tools (see YouTube). On this unit, the retainer on the non-drive side is aluminium. This seems to work well, and hopefully that won't cause problems the next time I need to change it.

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5 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 5/5
5
Excellent service
by Anonymous user on 28/05/2020

Easy to order, great price, delivered quickly and does the job. What more could I ask for. Thank you Tredz :)

Easy to order, great price, delivered quickly and does the job. What more could I ask for. Thank you Tredz :)

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5 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 5/5
5
Bottom bracket
by Anonymous user on 27/05/2020

Fitting was no problem. So far, very smooth. Hopefully won't need to be changed for a good while.

Fitting was no problem. So far, very smooth. Hopefully won't need to be changed for a good while.

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5 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 5/5
5
Top of the class.
by Anonymous user on 11/05/2020

You cant go wrong with Shimano components and this bearing is no exception. Very well made and finished ensuring a perfect fit that promises to last even with the hardest treatment. Sensibly priced especially from Tredz.

You cant go wrong with Shimano components and this bearing is no exception. Very well made and finished ensuring a perfect fit that promises to last even with the hardest treatment. Sensibly priced especially from Tredz.

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5 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 5/5
5
Good value for the money
by Anonymous user on 17/03/2020

Tredz were the only company who had the right product in the correct size

Tredz were the only company who had the right product in the correct size

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4.8 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 4.5/5
4
Shimano Bottom Bracket BBUN55
by Anonymous user on 11/06/2019

Great value bottom bracket. Fitted easily into my old touring frame. Smooth running, so very pleased.

Great value bottom bracket. Fitted easily into my old touring frame. Smooth running, so very pleased.

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4.2 out of 5
Build Quality: 3.5/5
Performance: 4.5/5
Value For Money: 4.5/5
5
Shimano Bottom Bracket BBUN55
by Anonymous user on 20/05/2018

Easy to fit, far better quality than original. Best bike back on the road!

Easy to fit, far better quality than original. Best bike back on the road!

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5 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 5/5
4
Decent workhorse
by John R on 11/09/2017

This is the 3rd one of these I've had in 5 years. I my MTB all year round in all weathers. Daily on the road / canal towpath, for the commute, & several times a week off road. Although they claim to be "sealed" the seals can be removed & regreased relatively easily. For the money you can't really go wrong. Appulsorse.

This is the 3rd one of these I've had in 5 years. I my MTB all year round in all weathers. Daily on the road / canal towpath, for the commute, & several times a week off road. Although they claim to be "sealed" the seals can be removed & regreased relatively easily. For the money you can't really go wrong. Appulsorse.

Close review
4 out of 5
Build Quality: 3.5/5
Performance: 4/5
Value For Money: 4.5/5
5
Top value bottom bracket.
by Craig D on 27/11/2015

I bought this item to replace the stock bottom bracket on my mtb. The build quality is first class and this bottom brackets are pretty much bomb proof. Took 10 minutes to install with basic tools. There are newer and lighter bottom bracket systems out there but for cost, ease of use and dependability, there's no need to upgrade my chainset until I'm ready to replace my groupset.

I bought this item to replace the stock bottom bracket on my mtb. The build quality is first class and this bottom brackets are pretty much bomb proof. Took 10 minutes to install with basic tools. There are newer and lighter bottom bracket systems out there but for cost, ease of use and dependability, there's no need to upgrade my chainset until I'm ready to replace my groupset.

Close review
5 out of 5
Build Quality: 5/5
Performance: 5/5
Value For Money: 5/5
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Bottom Brackets Guide

What is a bottom bracket?

A bottom bracket is the bearings that the crank axle passes through, keeping the cranks turning smoothly.

Who needs a bottom bracket?

Every bike has a bottom bracket, so if your bike is creaking or feels stiff or notchy as you turn the pedals, your bottom bracket might be worn out and need replacing.

What are the choices?

It’s not so much a choice as a matter of compatibility. You need to establish whether your bottom bracket is press-fit or threaded and what size. Then you need to make sure it is compatible with your crankset. If it’s worn out, replacing like for like is often the easiest thing to do.

What should I buy with it?

You need some specialist tools both to fit and remove bottom brackets and to remove the cranks to get at it.

Anything else?

If you’re fitting a bottom bracket into a brand new frame, your frame will need some preparation first. Bottom bracket shell facing tools can be very costly, so you might need to bring it into a bike workshop to get this done.

Delivery & Guarantee

UK Delivery Information

Please Note: Due to the current circumstances we are experiencing high demand so we may take a little longer than usual to despatch your order. Our Warehouse and Bike Build team are up and running as normal and we are taking active measures to ensure that we are following the government guidance with social distancing and additional health & safety measures have been put in place throughout the business. Please rest assured we will do everything we can to get your order to you as quickly as possible.

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.

Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

Please note that Pre-Order dates can sometimes change due to updated stock information.

Click here for more UK and international delivery information.

Returns & Warranty

It's easy to return a product with our 365 day, hassle free returns. 

We will give you a full refund or exchange on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.