Reverse Colab Pro Chain Tensioner The king of chain tensioners. The Reverse Colab Pro replaces your rear derailleur with a purpose-built chain tensioner for the simplest, most secure singlespeed or fixed drivetrain setup possible. A user-adjustable clutch system lets you fine-tune chain tension with a single allen bolt, eliminating chain slap across a huge range of bikes, suspension types, and riding styles. Fifteen millimeters of chainline adjustability via a single bolt means perfect chain alignment without removing the tensioner, and an adjustable limit stopper plus pinch bolt on the mounting bracket keep everything locked in place even when the rear wheel comes out. CNC aluminum pulleys, aluminum construction, and World Cup-proven German engineering make this the last chain tensioner you'll ever need. Features User-adjustable clutch system lets you fine-tune chain tension with a single central allen bolt across a huge range of adjustment, eliminating chain slap on any bike, suspension setup, or riding style15mm of chainline adjustability via a single bolt for perfect chain alignment without removing the tensioner from the bike Adjustable limit stopper and pinch bolt on the mounting bracket provide secure chain retention and maintain tensioner position when the rear wheel is removed CNC aluminum pulleys for maximum durability and consistent rolling performance Derailleur hanger mount for a clean, straightforward installation on any standard derailleur hanger Compatible with 9, 10, and 11-speed chains and 13-17 tooth cogs Aluminum construction, engineered and made in Germany SPECIFICATIONSMount Derailleur hanger Chain Compatibility9, 10, 11-speed Cog Compatibility13-17 tooth Chainline Adjustability15mm Material Aluminum Weight207g Made In Germany | Reverse Components | Reverse Colab Pro Chain Tensioner Black