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

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Questions & Answers (1) Q & A
Special heavy duty 4 bearing ISIS bottom bracket for Brompton bikes.

Designed for use with Joseph Kuosac cranks - #46136L155

Standard 3 bearing version also available - #46138
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Questions & Answers (1)
Questions about JK BB Fitment and Durability
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

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.