SHIMANO 105 5750 Compact Crankset Compact design lightens your load and expands your gear range without the added weight and complexity of a triple Hollowtech II design uses a wider bearing placement to maximize stiffness while keeping weight to a minimum - what you get is a dramatically stronger pedaling force with better power transfer, acceleration and speed Wider gear range accommodates most cycling situations and offers less chain touch in the small/small combination Individually machined chainring teeth improve chain contact for greater shifting performance Improved bottom bracket seals reduce contamination and friction