SLX is the new groupset from Shimano with options designed to cater for the differing needs of the modern day trail rider. SLX borrows elements from both the new XT group (Shadow rear derailleur, composite middle ring and ServoWave brake levers) and the best bits of the LX and Hone ranges it replaces to offer durability and high performance at a sensible price. Shimano SLX Disc Brake Rotor - 203mm offers secure and easy set-up with the proven Centre-Lock mounting system.