IRD Defiant QB95 JIS English Thread Sealed Cartridge Bottom Bracket 68 mm Shell

Customer Reviews (4)
4 / 5| Write your review
£86.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
- IRD's top level JIS square taper bottom bracket
- High polish finish
- Japanese sealed cartridge bearings
- POM industrial seals
- CNC-machined A6061 aluminum cups
- SCM415 chromoly spindle
- Made in Japan

Replacement Bearings (not covered under warranty as they are a wearing component)
Size: 173110-2RS
Product Reviews (4)
Questions & Answers (5) Q & A
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Product Reviews (4)
Overall Product Rating 4 / 5
Impossible to replace bearings
By Troels Gorm Larsen
04 Feb 2023
1 / 5
ConsBearings can not be replaced
ProsOK, until the bearings need replacement
Bearings spec given as 163110 2RS, also by producer IRD. In reality bearing ID is 17mm. This bottom bracket lasted me less than three years as the bearings can not be replaced. Bearings 173110 2RS does not seem available.
Excellent quality
By Andrew Baselgia
08 Apr 2022
5 / 5
I recommend this product
ConsNone that I can think of
ProsVery well made
I purchased the IRD Defiant B.B. to use with the Chater Lea chain set, for a project I'm working on, it's slowly coming together. Excellent quality B.B.
Smooth, high quality.. Looks amazing
By Matthew Tuttle
13 Apr 2021
5 / 5
I recommend this product
ConsHard to find online, not many sizes available
ProsMade in Japan, Sealed, quality parts, 10 year warranty
Very similar quality to a phil wood etc, it is high end and worth the money if you want a bottom bracket that will last you years and run smooth.
By Claude Marcoux
15 Feb 2021
5 / 5
I recommend this product
Smooth bearings and everything well made.
Questions & Answers (5)
Can I replace my BB Shimano UN25 sealed with this one?
02 Nov 2022
Thank you for your enquiry. As long as the shell size is the same & you pick the matching axle length, as they are both for square taper chainsets this will be fine.
Regards. JP 02/11/22
Hi. Would the 118mm fit a Brompton B75? Thanks.
27 Oct 2021
Thank you for your enquiry, yes it will be fine
Can I use this as replacement for a Shimano UN55 BB?
16 Mar 2021
Thank you for your enquiry, yes will fit fine

WD 16/03/21
Spindle symmetry
10 Apr 2020

Do these bottom brackets have symmetrical spindles?

I just checked a 110mm one, it appears to be symmetrical RT100420
Differences between IRD BB's 95/75/55
01 Aug 2018
What are the weight, longevity and seal differences between the three square taper IRD BB's 95, 75 and 55.
Hi, the weights are 237g, 224g and 278g for the 103mm respectively. We can't comment on the longevity and there is very little information on the seals. Thanks