Reverse Colab Pro Chain Tensioner SilverReplaces rear derailleur with chain tensioner for a simple, secure drivetrain Offering a user adjustable clutch system, the Colab Pro allows the rider to fine tune the level of tension on the chain, to give the quietest ride no matter how hard the terrain gets. A simple turn of the central allen bolt offers a huge range of adjustment to suit every bike, suspension and riding style eliminating chain slap 15mm of adjustability for the chainline by