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IRD Quad QB55 JIS English Thread Sealed Cartridge Bottom Bracket 68 mm Shell

Customer Reviews (2)

5 / 5| Write your review

£38.99

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Details

- English threads
- Tange-Seiki sealed cartridge bearings
- JIS square taper CrMo spindle
- Steel cups, aluminum sleeve
- Made in Japan

Product Reviews (2)

Questions & Answers (9) Q & A

Specification

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Product Reviews (2)

Overall Product Rating 5 / 5

Fingers crossed

By Jeremy

18 Jul 2024

5 / 5

I recommend this product

Eighteen months ago, I bought a Shimano UN300 to replace the original UN5* series BB on my 15 yr old tourer. The UN300 failed after only 18 months so I contacted SJS asking for advice. They recommended IRD and I went for the least expensive model with the steel cups. The cartridge bearings, which are Tange Seiki, are a lot deeper than the Shimano UN300 ones. Hopefully this will have been a 'fit and forget' purchase!?

High quality bottom bracket

By Peter C

31 Oct 2020

5 / 5

I recommend this product

Consnone

ProsVery smooth bearings, high quality bearing seals, very good material finish

Bought the 122mm version and was replacing a shimano BB-UN54 bottom bracket.
I decided steel cups were better in my old steel frame as the threads were less likely to seize than aluminium cups, which you get with the more expensive Quad 75. The weight penalty is insignificant for me.
I measured the asymmetry when fitted and the spindle is about 0.5mm from the frame centreline towards the right (drive) side of the bike, which is unnoticeable.
Bearing o/d looks slightly larger than the previous shimano bearings which, in theory, implies longer life.
Lastly, it's great that SJS cycles stock the IRD brand which specialise in producing high quality parts to keep older models of bicycles on the road.

Questions & Answers (9)

Is this suitable for a bike with cable guides under the bottom bracket?

By Jonathan Reynolds

04 Jun 2026

SJS Customer Service:

Yes it is suitable, for screw in holders you might need to back the screw off for initial fitting. SK 04/06/26

Motobecane Mirage

By Kasper

01 Jun 2026

I am hoping to install this bb, along with the Sunrace R81 crankset, in an old Motobecane Mirage frame, using the IRD conversion cups to swiss threads. At the moment I still have the original Stronglight cups and spindle installed, which seems to give a chain line of around 50 mm. However, the crank set probably needs a shorter chain line - it seems that Shimano use 43,5 mm and I assume Sunrace use the same? Which size bottom bracket is appropriate for this? And, is it only the crank set that determines chain line or does the frame and/or rear wheel/cassette affect it as well?

SJS Customer Service:

If you need to add another 6-7mm of chain line then add 6-7mm to the required axle length, however this may affect the Qfactor of the chain set. SK 02/06/26

Is the 110mm version correct for thorn cycles triple crankset

By Anonymous

30 Apr 2024

I have an old surly long haul trucker that has a 68mm shell. Is the 110mm with version correct for use with the thorn cycles triple crankset? I have 3x9 setup

SJS Customer Service:

Yes it will work. SK 02/05/24

Are bearings replaceable?

By hello

21 May 2023

Hi,

Can the bearings of these be replaced, and if so, do you sell them?

SJS Customer Service:

Only the IRD QB-95 is rebuildable, we do not stock the bearings. SK 22/05/23

Hello, can I use the Shimano tool (SJS part No. 858) to install this IRD bottom bracket ?

By Anonymous

28 Feb 2021

SJS Customer Service:

Thank you for your enquiry, yes will fit fine.

WD 01/03/21

What is the weight of this bottom bracket?

By Anonymous

25 May 2020

SJS Customer Service:

Hi, it is 310 grams (length 113). Thanks

Can I use this on a B75 Brompton?

By Peter

09 May 2020

Hi is it possible to replace the stock BB with this model in 118mm length on a Brompton B75 and still have good measurements and compatibility with the oem spider cranks? Thanks!

SJS Customer Service:

Hi, yes it should be OK. Thanks

Please elaborate on the asymmetry

By Anonymous

13 Sep 2018

Since the spindle does not protrude equally on each side, I assume that the right (drive) side is longer than the other side. Is that correct?
On the 110 mm spindle length, how many millimeters does the spindle protrude from the cartridge on the right side? And on the left?
Thanks

SJS Customer Service:

Hi, yes in most instances they are off set. However on this BB the 110 is close to 12mm on each side. Thanks

Is the spindle symmetric?

By Anonymous

06 Sep 2018

In other words, does the spindle protrude equally much on each side of the cartridge?

SJS Customer Service:

Hi, the spindles do not protrude equally on each side. Thanks