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

Customer Reviews (1)
5 / 5| Write your review
£38.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
- English threads
- Tange-Seiki sealed cartridge bearings
- JIS square taper CrMo spindle
- Steel cups, aluminum sleeve
- Made in Japan
Product Reviews (1)
Questions & Answers (8) Q & A
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Product Reviews (1)
Overall Product Rating 5 / 5
High quality bottom bracket
By Peter C
31 Oct 2020
5 / 5
I recommend this product
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 (8)
Are bearings replaceable?
21 May 2023

Can the bearings of these be replaced, and if so, do you sell them?
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 ?
28 Feb 2021
Thank you for your enquiry, yes will fit fine.

WD 01/03/21
What is the weight of this bottom bracket?
25 May 2020
Hi, it is 310 grams (length 113). Thanks
Can I use this on a B75 Brompton?
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!
Hi, yes it should be OK. Thanks
Protrusion on right side
27 Feb 2019
Previous question says it protrudes 12mm on each side, adding 68mm BB width only gives 92mm total. That leaves 18mm unaccounted for. Can we have the measurement from where the BB contacts the right side of the frame i.e the inside of the flange.
Please elaborate on the asymmetry
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?
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?
06 Sep 2018
In other words, does the spindle protrude equally much on each side of the cartridge?
Hi, the spindles do not protrude equally on each side. Thanks
Hello, what is the tool to use Thank you
02 Dec 2017

I would recommend - SJS Cycles part number : 14502 OR SJS Cycles part number : 16507
Life warranty against manufacturing defects.