Hi,
I have a 14spd road bike with 52/42 130mm chainrings. I have noticed that I could use higher and lower gears-
If I upgrade to a 53T/39T chainring set (still 130mm), will I notice much difference? I don't really want to replace shifters or the cassette and I found a 53T/39T raceface chainring set for $30 on nashbar.

Also, It says it is compatible with 9/10spd drivetrains. Will it work with my 7spd? What is the difference between that and my 7spd drivetrain? I can't find any chainrings that are 7spd compatible.

Thanks for your help.