The operative word is upgrade. The Shimano 105 FC-5750 10-speed compact crankset is a whopping 60 grams lighter than its predecessor, and probably a lot lighter than the crank your bike came with. A larger gap between the top and low gear reduces chain rub in small/small gear combinations. Dual SIS front index shifting gives you added shifting performance and Shimano's Hollowtech spindle technology gives you increased power transfer while reducing weight.
Item No. » SH-FC5750