The SLX group includes two types of Hollowtech II cranksets for different types of riding styles. The first is an all-mountain compact drive crankset with a double chainring 36/22T combination, designed to give more range over the traditional 32/22T setup. It has a reinforced construction with increased axle and spider strength to meet the rigors of all-mountain riding. This crankset includes a “honeycomb” bash guard, a steel pedal thread insert and is claimed to be 100% stronger than the XT crankset.
In addition to the double/bash guard chainset, there will also be a triple SLX crankset for cross-country riding where a larger gear range is required. Using technology from the current generation of XT and XTR chainsets the triple will come with a composite/steel middle chainring that doubles durability over the standard middle ring and improves the shifting performance. It will be available in a chainring combination of 44/32/22T.
Buy Shimano SLX M665 Double Chainset from Chain Reaction Cycles, the world's largest online bicycle store.