If I have Shimano 2200 gears on my bike, can I upgrade to something better for example all the way to dura-ace?
Does it really improve efficiency?
I'm thinking exactly the same thing although I have 105's. I was speaking to a friend yesterday who spent about £600 on a campagnolo groupset and he says he cannot believe the difference that it made. I myself am quite sceptical although the better the groupset the smoother the changes as well as less weight, although I prefer the clunk of the gears as I know they are moving.