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Writer's picturebeckalim

Brompton Stock C Line 2-Speed Upgrade to 3-Speed

Updated: Dec 31, 2024

This is the most economical upgrade kit for converting a Brompton stock C Line from a 2-speed to a 3-speed bike.



All original rear derailleur parts can be reused without replacement.


The original 2-speed shifter only needs an upgrade with the 3-speed internal mechanism kit.

The jockey wheel bushing and axle need to be replaced with an extended axle.


For Brompton enthusiasts who love the classic look, this wheelset and kit offer an economical 3-speed upgrade solution. Once the installation is completed with the integrated unibody cog set 11-14-17t (included), the appearance will hardly show any changes. The upgrade to the 3-speed mechanism (included) on the left-hand side stock shifter will go unnoticed.


Ride faster, stay classic!



The Set includes


  • Hubsmith BUMBEE A349 2 Speed wheelset (compatible with C Line 2 Speed Brompton

  • MiniMODs X3 Unibody Cogs set

  • Long Bush Kit

  • PYC 11-speed chain

  • MiniMODs 3s Indexed Kit

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