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Thun Brompton size IBEX-ML 68 x 119mm Bottom Bracket

TH004

Brompton

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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Thun Brompton fit IBEX-ML 68 x 119mm Bottom Bracket

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: 

  • Material: Cold forged and Zinc coated steel spindle
  • Carbon composite: Sleeves and cups
  • Sealed bearings
  • Cups compatible with PEDRO's key
  • Square tapered
  • Spindle length: TH004 - 120mm
  • Weight: 265g

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 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

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Thun Brompton size IBEX-ML 68 x 119mm Bottom Bracket

Thun Brompton size IBEX-ML 68 x 119mm Bottom Bracket

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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Data sheet

DisciplineBrompton
Bottom Bracket Shell Size68mm