Modern technology for optimum control, robust, proven technology for durability and reliability.significant advantages- precise, consistent, effortless and easy shifting with 10-speed shifting systems- suitable for various bike types from sporty to comfortable trekking bikes- efficient pedalling with good cadence thanks to optimised gradation for paved pathsShimano Shadow rear derailleurWith its sophisticated technology, the Shimano Shadow rear derailleur is also particularly suitable for a more aggressive riding style. The extremely minimised profile brings with it a number of advances. Thanks to its flat design and single-bias construction, the rear derailleur does not hit the chainstay even in the roughest conditions. The derailleur works cleanly and quietly. 36 teeth.