The Shimano RD-M675 SLX SGS Rear derailleur is perfect for all-mountain and cross-country mountain bikers! It is designed to deliver quick and reliable gear changes, which is incredibly useful on short uphills and downhills. Plus, it is designed to prevent the chain from jumping. Youll also be happy to know that it is very quiet, making for an overall more comfortable ride! Not to mention - the RD-M675 SLX SGS Rear derailleur is pretty light!