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Brompton bottom bracket cartridge JIS119mm

Brompton bottom bracket cartridge JIS119mm

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Brompton JIS bottom bracket - for the Brompton spider crankset introduced in 2013 

Note: Not compatible with the older fixed crankset 

Brompton Ref: Q100001 / QBBCART-JIS
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Brompton bottom bracket cartridge- JIS 119mm

The bottom bracket comes complete with two crank bolts

Essential if you are changing from a 'fixed' to 'spider' crankset

Note: This is not the bottom bracket that was recalled by Brompton in 2017. Bottom brackets factory fitted were a different one to those available as an after market option.

This Bottom Bracket is compatible in size with all 16 inch wheel Brompton bikes (they have a 68mm bottom bracket shell), but if you are replacing and have the fixed (non-spider) crankset, then you will also have to replace the crankset

Please note - if you are replacing the older bottom bracket, you also need to replace the front chain ring and left hand crank.

A bit of Brompton Bottom Bracket Alliteration History

Brompton bicycles use what is known as a square taper bottom bracket ... but its not quite that simple

In January 2013 Brompton introduced a new crankset, known as the spider crankset. This had a detachable chainring, making it easier to replace just part due to wear or change gearing

This new chainset uses a different bottom bracket to the older fixed chainset - this is known as JIS (Japanese International Standard) as opposed to ISO (International Standards Organisation). These look almost identical - but the JIS has a slight notch cut out of the end

During 2015 the Brompton JIS bottom bracket was changed from FAG (the manufacturer) to StrongLight (the documentation in the packet hasn't yet changed with it)

During 2017 the old ISO  bottom bracket (not this one, but the one used with the old fixed crankset) was discontinued

Also during 2017 the Stronglight bottom bracket was replaced (as an after-market option) by the Thun IBEX bottom bracket. When Brompton recalled the FAG bottom brackets (different one were being used on factory bikes to after-market sales), the replacements were also these Thun IBEX bottom brackets

In September 2017 Brompton announced a recall of the FAG JIS bottom brackets - these were factory installed  (between April 2014 and May 2017) bottom brackets, not the ones sold on the after market

Tools Required

For removal / installation bottom brackets, you will need a special tool

Bottom bracket tool for the earlier FAG JIS bottom bracket - then look here (it's the Park Tool BBT-4).

Bottom bracket tool for the later StrongLight / Thun IBEX JIS bottom bracket - then look here (it's the Park Tool BBT-22). This is a standard Shimano 22 spline tool.

To remove the cranks you will need a crank puller tool - CCP-22 square taper crank puller tool - this tool first screws into the crank then when done up pushes the crank away from the bottom bracket 

Bottom bracket removal and installation

Before removing the bottom bracket from your Brompton, you will also need to remove the crank arms (this whole process will be easier if you have a workstand)

We made the video below to show how to remove the old bottom bracket

Once the cranks are removed, you can remove the bottom bracket itself

This other great article from Park Tool shows how to remove and install the bottom bracket

Brompton 2021 Q part code: Q100001
Brompton Q part code: QBBCART-119-JIS
Brompton part number: 9044016