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TH004
Thun Brompton fit IBEX-ML 68 x 119mm Bottom Bracket
This is a replacement bottom bracket for use with the Brompton spider crankset introduced in 2013
Note: Not compatible with the older fixed crankset
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This bottom bracket can be used in place of the Brompton bottom bracket cartridge- JIS 119mm
Comes complete with two crank bolts
Thun recommends NOT greasing the bottom bracket as this could swell the plastic and cause issues, this bottom bracket has the following attributes:
Essential if you are changing from a 'fixed' to 'spider' crankset
This Bottom Bracket is compatible in size with all A, C and P Line 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.
Tools RequiredFor 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 |
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
If your question has not yet been answered here, use the form below to ask something
Discipline | Brompton |
Bottom Bracket Shell Size | 68mm |