Shimano UN55 Square Taper Bottom Bracket
Shimano UN55 Square Taper Bottom Bracket

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RRP$39.99
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73 x 110mm

73 x 113mm

73 x 118mm

73 x 122.5mm

70 x 107mm

70 x 110mm

70 x 113mm

70 x 115mm

68 x 113mm

68 x 110mm

68 x 118mm

68 x 115mm

68 x 127mm

68 x 122.5mm

73 x 107mm

68 x 107mm

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DESCRIPTION
SPECS

Shimano UN55 Bottom Bracket

Shimano Road UN55 model has super-accurate bearings for smooth operation and improved durability

Features:

Durable, hard-wearing sealed cartridge bottom bracket.
Maintenance-free sealed cartridge bearing assembly keeps out dirt, mud and water for long bearing life
Fast and easy installation without adjustment
Hollow Axle

Buy Shimano UN55 Bottom Bracket at Chain Reaction Cycles, the world's largest online cycling store.

Colour: Silver
Size: 73 x 110mm, 73 x 113mm, 73 x 118mm, 73 x 122.5mm, 70 x 107mm, 70 x 110mm, 70 x 113mm, 70 x 115mm, 68 x 113mm, 68 x 110mm, 68 x 118mm, 68 x 115mm, 68 x 127mm, 68 x 122.5mm, 73 x 107mm, 68 x 107mm
Option: English Thread, Italian Thread

REVIEWS
QUESTIONS

Rated 4.6 out of 5 by 17 reviewers.

Rated 5 out of 5 by Akira Good replacement for standard part much better made and hopefully seals than OEM part. 03 March 2014

Rated 4 out of 5 by Carletto74 Ottimo elemento. Acquistato per sostituire elemento originale, ne sono molto soddisfatto soprattutto per il rapporto qualità/prezzo. Unico neo il peso, non proprio una piuma. 27 February 2014

Rated 5 out of 5 by Neezurt PERFECT! Well, for the money, you just can't go wrong. As long as it's the right size for your BB, it's easy to fit, though you'll need a special tool. I bought the Weldtite Shimano Bottom Bracket Cartridge Tool from CRC for not much more than a fiver. I've done around 400 miles on it now, and it hasn't missed a beat. The cranks turn well - smoothly and quiet. Great for the money - and, in my case, it transformed my old MTB rebuild (which had a well-worn BB!). 25 February 2014

Rated 5 out of 5 by WilsonC Quality kit! Used this in my rebuild from Cube Ltd Race frame. Super solid and smooth so far. Quality service from CRC too. 15 February 2014

Rated 5 out of 5 by Jimbolina77 Solid performance this is the 3rd UN55 i have had over the years, always pure quality of performance at a decent price Can not fault it really 21 January 2014

Rated 4 out of 5 by WhatO Used for about 200kms so far, Working well. I replaced the stock cheap-as BB in my Specialized Hardrock after 8 months as it had started to fail. This Shimano unit was nearly the top level component I could find, so matched with the great price I can't go wrong. Working well now, the pedalling action is much improved. 15 January 2014

Rated 5 out of 5 by MacGrumpy Excellent product at a reasonable price I already have one of these in my old frame and only bought this one as I could not get the old one out to use in my Superlight. 07 January 2014

Rated 5 out of 5 by Volf1941 Лучшая замена shimano un-26 Товар получен вовремя и в соответствии с заказом. Деталь установлена на велосипед. Заказом доволен полностью. 07 January 2014

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13 Questions : 16 Answers

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Has staff answer

3 answers

Does this come with crank bolts?

Age: 18 to 24

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Attitude: Just for Fun

2 months ago

FourPalad

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Answer:

Yes comes with plain hex head steel ones

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4 days ago

Akira

Reading,GB

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Staff
Best answer
On the up

Answer:

Crank bolts are not included with this bottom bracket; the suggested bolts below are compatible.

Attitude: On the up

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Brand-X Self Extracting Square Taper Crank Bolts

(24)

1 month, 3 weeks ago

CRCAndyC

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Just for Fun

Answer:

No, no crank bolts comprised.

Age: 35 to 44

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Attitude: Just for Fun

3 days ago

Carletto74

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2 answers

Could you recommend a tool for fitting this bottom bracket

Age: 25 to 34

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1 month, 3 weeks ago

Sverrir

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Answer:

The suggested square taper tool suggested below is required for fitting this bottom bracket. For future reference; the crank puller will likely be required to dissemble it again.

Attitude: On the up

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X-Tools BB Tool Octalink-Square

(19)

Park Tool Cotterless Crank Puller CCP22

(4)

1 month, 2 weeks ago

CRCAndyC

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Just for Fun

Answer:

This is perfect:
http://www.chainreactioncycles.com/it/it/weldtite-shimano-bottom-bracket-cartridge-tool/rp-prod86711

Age: 35 to 44

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Attitude: Just for Fun

3 days ago

Carletto74

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What size Bottom bracket do I use with Shimano M442 I have 68 MM bottom Bracket shell ?

Age: 55 to 64

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5 months, 3 weeks ago

steelman825

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Staff

Answer:

Ideally the best way to work this out is to measure the overall length of the old bottom bracket it is replacing. So measure from spindle tip to spindle tip. (the overall length). This will give you the measurement you need. So 68x???mm. If you are still unsure contact us below on:
tech@chainreactioncycles.com

5 months, 2 weeks ago

CRCChurchy

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I have an old Bianchi Columbus Steel Frame. What type of bottom bracket should I need for replacement, Italian or English Thread?

I have a 68 mm shell. Please advise.

Thanking you in advance.

Regards,

Ben-Hur

Age: 45 to 54

Gender: Male

Attitude: Passionate and Obsessive

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Shimano UN55 Square Taper Bottom Bracket

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5 months, 2 weeks ago

BenHur

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Staff

Answer:

As your frame features a 68mm bottom bracket shell you will require an English threaded bottom bracket.

5 months, 2 weeks ago

crcsimon

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What size UN55 bottom bracket to use with a Giant Defy 3 2009 model please?

What size UN55 bottom bracket to use with a Giant Defy 3 2009 model please?
Using a triple crankset as standard spec for that model bike.

5 months, 2 weeks ago

Drnick77

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Staff

Answer:

We do not have specific technical data for the Giant Defy to identify the size of bottom bracket you need. Though it is easy to identify the size you need your self.

You will have to measure your frames bottom bracket shell width, most likely 68mm. Then remove your crank arms and measure the current bottom bracket spindle length. With these two figures you can select the appropriately sized UN55 BB.

For removing and fitting a BB at home you will need the tools below.

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Weldtite Shimano Bottom Bracket Cartridge Tool

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Park Tool Cotterless Crank Puller CCP22

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5 months, 1 week ago

CRCJames

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Choosing correct bottom Bracket

Which size and version replaces a VP-BC55 with a 113 mm Spindle and 38mm housing diameter?

Age: 45 to 54

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5 months, 1 week ago

Ianc59

Newark,GB

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Staff

Answer:

From what i can see the version you need is the English 68 x 113mm version. You can check this by measuring the with of the bottom bracket shell on your frame. This will give you the first measurement you need. (ie. 68,70) the next thing to do is measure the old bottom bracket from end to end.(spindle end to spindle end) This will give you the second measurement. (ie. 113, 115 etc) If you have any further questions please contact us at tech@chainreactioncycels.com

5 months, 1 week ago

CRCChurchy

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I have just removed an old bottom bracket from my mountain bike. The shell is 68 but the spindle is 124.5 long. What cartridge do I get 122.5mm or 127

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4 months, 1 week ago

Goosey

Southend on Sea,GB

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Just for Fun

Answer:

The axle length required is dictated by the chainset you are using, as different chainsets will have differing levels of offset. If you are only replacing the bottom bracket on an existing crank, side with the longer option if stuck between two sizes.

Age: 25 to 34

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4 months ago

CRCHops

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What size UN55 Bottom Bracket to go with M442 chainset?

I have a Canondale T700 frame circa 1994. The shell is 68mm wide with a diameter of 30mm.
I don't have the original bottom bracket to measure

Age: 55 to 64

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4 months ago

omil

WYLAM,GB

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Staff

Answer:

For a triple chainset it is recommend that a 118mm or 115mm spindle is fitted.

4 months ago

crcsimon

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Bottom Brackets for BTwin Riverside 5

Dea Sir./M.am.
I need to replace my BTwin Riverside-5 bottom-bracket. I bought it on 2009, I use it every day for commuting to work and it has about 14000km. I want to buy the new one and then disassemble and replace mine, so that I can keep using my bike.
The bottom bracket is a Shimano Square Taper.
I measured the diameter of the left side "screw", and it is about 35 mm. While the distance between the pedals is about 140mm.
Can you suggest the correct bottom bracket dimensions to use to replace mine.

Thank you in advance for your help.

Best Regards,
Simone

2 months, 3 weeks ago

simonep

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Passionate and Obsessive

Answer:

The description of BTwin Riverside-5 2009 says it has octalink Shimano M521, 48-36-26 crankset with 121cm-length BB. Octalink, not square.
May be you have some another type of this bicycle, so try to find the type of your crankset. BB depends only from crankset, not frame of the bicycle.

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2 months, 3 weeks ago

Alexandr

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