Reverse Colab Expert Chain Tensioner 40290

- Replaces rear derailleur with chain tensioner for a simple, secure drivetrain\n- Expert version elevates the Colab chain tensioner for the most extreme use and easy adjustment\n- Adding 15mm of adjustability for the chainline by loosening one bolt, the Expert version helps riders achieve perfect chain alignment without the removal of the tensioner\n- Adjustable limit stopper as well as a pinch bolt on the mounting bracket and higher spring tension provide more chain retention and also maintains position when the rear wheel is removed\n- Compatible with 9/10/11-speed chains, 13-17 tooth cogs\n- Aluminum construction, made in Germany