Transform Your Brompton P/T Line to 7-Speed Performance
The MiniMODs 7 Speed Upgrade Kit transforms your Brompton P/T Line from a 4-speed to a comprehensive 7-speed external gear system. Specifically designed for Brompton's P Line, T Line, and Electric P Line models, this complete upgrade kit includes the X7 Advanced Cog Set with an 11-32T range, precision CNC-machined rear derailleur assembly, lightweight tensioner with ceramic components, and a double-tap 7-speed thumb shifter. The 11-32T configuration offers significantly wider gearing range compared to the standard setup, making climbs easier while maintaining high-speed performance on flats.
All components are precision CNC-machined from aluminum alloy for lightweight durability, with a titanium tensioner spring for improved responsiveness. The kit works with your stock P/T Line wheelset and is optimized for use with an 11-speed chain. Installation requires some mechanical skill and patience for fine-tuning, but delivers a dramatic improvement in your Brompton's versatility across varied terrain.
Complete 7-Speed Conversion System
- X7 Advanced Cog Set with 11-32T gear range (11-13-16-20-24-28-32T configuration available).
- Standard 11-28T configuration (11-13-15-18-21-24-28T) also available for tighter gear steps.
- Maximum cog size of 32T provides significantly easier climbing gears compared to stock setup.
- Precision CNC-machined parallelogram rear derailleur with spring-activated main body and dual jockey wheels.
- Lightweight tensioner arms with ceramic bushing and jockey wheel for smooth, quiet operation.
- Titanium tensioner spring delivers improved durability and responsive shifting.
- Double-tap 7-speed thumb shifter mounts directly below left-hand brake lever, replacing stock 4-speed shifter.
- CNC-machined aluminum alloy components throughout for minimal weight addition.
- Cable holder included to prevent brake housing wear when chain is on largest 32T cog.
- Compatible with stock P/T Line wheelset—no wheel modifications required.
- Existing shifter housing on P/T Line can be reused without length changes.
- Optimized for 11-speed chain for best shifting performance and efficiency.
- Designed specifically for P Line, T Line, and Electric P Line rear triangle geometry.
