MiniMods 5 Speed Upgrade Kit for Brompton Bicycle

Includes:

• X5 Cog Set

• Rear Derailleur Assembly

• 7-Speed Thumb Shifter

Key Features:

• Optimized for use with an 11-speed chain for best performance

• CNC-machined aluminum alloy components: lightweight derailleur, tensioner arms, fixture, and thumb shifter

• Compatible with A Line, C Line frames (P/T Line-specific version available in a separate listing)

• Comes with the X5 Advanced Cog Set pre-installed on the stock wheelset, offering a 5-speed range of 11–25T 

• Maximum cog size: 25T (compared to the original 15T max on A/C Line)

• Titanium tensioner spring for improved durability and responsiveness

• Precision CNC-machined advanced parallelogram derailleur: spring-activated main body, dual jockey wheels, and mounting fixture

• Double-tap 7-speed thumb shifter with included cable