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Joseph Kuosac Special Heavy Duty 4 Bearing ISIS Bottom Bracket for Bromptons - 118 mm

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£49.99

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Details

Special heavy duty 4 bearing ISIS bottom bracket for Brompton bikes.

Designed only for use with Joseph Kuosac cranks (part number 46136)

Please note: will not fit standard Brompton chainsets

Standard 3 bearing version also available

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Questions & Answers (2)

Can I use this with any ISIS type crank-set?

By Chris

07 Jan 2019

Is it possible to use this bottom-bracket in any standard 68 / 73 mm English threaded BB shell and with any conventional ISIS type crank-set? (e.g. on a mountain bike frame, and with DMR Crisis cranks)

SJS Customer Service:

Yes, this should be fine!

Thanks - 08/01/19

Questions about JK BB Fitment and Durability

By Butch McNurlan

20 Oct 2017

Does the "Joseph Kuosac Special Heavy Duty 4 Bearing ISIS Bottom Bracket for Bromptons - 118 mm" require any modifictions to the frame in order to install this bottom bracket into my Brompton?

Also, is the Kuosac 4 bearing BB more durable than the Brompton BB? I have had my bicycle now for three years and am surprised to hear a groaning noise coming from the BB that is in time with the full rotation of the crank.

Do you have a recommendation / do you carry other durable BB's for the Brompton?

Thank you for reviewing my questions.

Very Respectfully,
Butch McNurlan

SJS Customer Service:

Hi,

This bottom bracket will not require any modification to your frame, but please be aware that it cannot be used with regular Brompton cranks. This bottom bracket is designed solely for use with Joseph Kuosac's own cranks for Bromptons. These bottom brackets use an ISIS splined interface where as the Brompton cranks use a square raper type interface. As it has the additional bearings it should be stronger and last longer as the load is spaced out more.

Thanks.