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

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£38.99

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SJS Cycles part number :

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Details

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

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Questions & Answers (8) Q & A

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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 (8)

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

Protrusion on right side

By David

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

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

Hello, what is the tool to use Thank you

By Anonymous

02 Dec 2017

SJS Customer Service:

Hi,

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

Thanks