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.
Compact design lightens your load and expands your gear range with Shimano's race-level technology
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 gives you more options for all riding situations without the added weight of a triple
Individually machined chainring teeth mean flawless shifting
Improved bottom bracket seals keep muck out and roll smooth season over season