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

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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 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 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 4.3 out of 5 by 7 reviewers.

Rated 5 out of 5 Quality & Value I've bought a few of these and I found the quality & value (from CRC) to be excellent 08 December 2013

Rated 4 out of 5 by Rolfe good kit for all the diffrent types of bb there are nowadays this is still easy to fit and reliable. 26 August 2013

Rated 5 out of 5 by Anonymous Best value on the bike I'm replacing one of these after six years and just under 10k miles. I make that out at about 2.8m revolutions. There's nothing wrong with the part. The one in a previous bike did a comparable mileage. You may be able to save a bit of weight in this area but you won't get better value. 01 April 2013

Rated 5 out of 5 by Anonymous Good product works very well. I used it for my late 70s peugeot, ideal for 70s and 80s peugeot in size 68x107mm 18 September 2012

Rated 3 out of 5 by Anonymous Only lasted 300km I bought one of these from CRC in Feb to replace the original factory fitted item on an old Raleigh MTB that had lasted 15 years and about 2000 miles. This BB has just failed after only 300km of mostly riding to work so I'm a little disappointed to say the least. I'm going to buy another as there doesnt seem to be an alternative unless I change my chainset as well (also new in Feb) 05 September 2012

Rated 4 out of 5 by Anonymous Great BB for the money This is a great bottom bracket as it is light, has smooth bearings and it is pretty well sealed against the elements. Have been using this BB for 8 months now and it has handled the abuse well. Ignore the guy above as bottom brackets do not come with crank bolts due to the fact that some bottom brackets are compatible with a variety of chainsets. 28 May 2012

Rated 4 out of 5 by Anonymous Good item but no screws provided! Good item, fit well - but no screws provided to re-attach peddles! Slightly unusual not to provide them in my experience... Minor thing though, all in all a good buy. 26 April 2012

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Has staff answer

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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

Gender: Male

Attitude: Just for Fun

2 months, 4 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

2 months, 3 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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2 months, 3 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.

2 months, 3 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.

2 months, 3 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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2 months, 2 weeks 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

Attitude: Passionate and Obsessive

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2 months, 2 weeks 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

2 months, 2 weeks 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

Gender: Male

1 month, 1 week ago

Goosey

Southend on Sea,GB

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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

Gender: Male

Attitude: Just for Fun

1 month, 1 week 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

Gender: Male

Attitude: Just for Fun

1 month, 1 week 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.

1 month, 1 week 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

3 days ago

simonep

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Social Answering Subscriber
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.

Age: 35 to 44

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3 days ago

Alexandr

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