MiniMODs X Series 7 Speed Derailleur + Tensioner Set for Brompton Bicycle P/T Line

$107.50 USD
Optional Parts
$107.50 USD


  • Aluminum alloy CNC machined lightweight colourful tensioner arms, parallelogram derailleur and fixture.
  • Compatible to P/T Line or Electric P Line frame (For A/C Line version are in other listing). Compatible with X7 advanced Cog Set on stock wheel set for up to 7 speed 11-28t (#X7AdvancedCogSet), or you will need to pair with 3party rear wheel with multi-cogs compatibility to take 7 or more 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 default only one tensioner arm for P/T Line (compatible to stock advanced parallelogram derailleur up to 5 speed 22t). You can add optional parallelogram derailleur (Spring activated main body, 2 Jocky wheels, fixture for further gear range). Cogs, thumb shifter, shifting cable and 3rd party upgrade wheelset are not included but optional.
  • Tested 11-28t / 7 speed possible on stock wheel with our optional parallelogram derailleur.
  • Special combo order offer if combined with X7 Advanced Cog Set (11-13-17-21-25-28t) for stock original advanced rear wheel.
  • Please find for A/C 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.