• Aluminum alloy CNC machined lightweight colorful tensioner arms, parallelogram derailleur, and fixture.
• Compatible with P/T Line or Electric P Line frame (A/C Line versions 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 3rd party rear wheel with multi-cogs compatibility to take 7 or more cogs (7 speed/28t possible), these are not included.
• Compatible up to 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 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 see A/C Line version in this LISTING.

11T Cog Refill:

The “11T cog refill” is a replacement for the smallest cog (the 11-tooth) on the 7-speed cassette. For riders who cover a lot of distance or tend to push hard in higher gears, this smallest cog tends to wear out faster. It’s especially common among heavier riders or those who often stay in the 11T gear for speed.

That’s why we recommend keeping a spare 11T cog on hand, especially if you ride frequently or intensively — it helps extend the life of your drivetrain and keeps your setup running smoothly.

Note :