MiniMODs X Series 7 Speed Derailleur + Tensioner Set for Brompton Bicycle A/C/E Line

$259.50 USD
Optional Parts
$259.50 USD


  • Aluminum alloy CNC machined lightweight colourful derailleur, fixture and tensioner arm.
  • Compatible to AC Line or Electric C Line frame (For P/T Line version are in other listing). Compatible with optional X series Unibody Cog Set on stock wheel set up to 5 speed 11-25t (#X5UnibodyCogSet), or you will need to pair with 3party rear wheel with multi-cogs compatibility to take over 4 speed cogs (7 speed/28t possible), these are not included.
  • Compatible upto 28T cog (original max 18t on P/T Line)
  • Titanium Tensioner Spring.
  • Smooth surface treatment with multiple colours to match your style.
  • Limited colour might only be available in 1st batch production.
  • Listing is only for one Parallelogram derailleur set (Spring activated main body, 2 Jocky wheels, fixture for A C Line /Electric C and extended tensioner arm included). Cogs, thumb shifter, shifting cable and 3rd party upgrade wheelset are not included but optional.
  • Tested 11-28t / 7 speed possible (3rd party rear wheel with free hub body that can take 7 cogs).
  • Tested on Stock 2/6 speed wheel 11-25t / 5 speed possible (optional X5 unibody Cog Set)
  • Special combo order offer if combined with X4 Unibody Cog Set (11-13-17-21t) or X5 Unibody Cog Set (11-13-17-21-25t) for stock original 2/6 speed rear wheel.
  • Please find for P/T Line version in this LISTING.

Note :

  • This modification is more difficult than the rather easy "plug and play" X3 Unibody Cogset external 3 speed upgrade. (please expect some more time and patience to finetune the result).
  • Do not recommand this as a DIY project, please consult your LBS mechanic before order.