I have a Shimano RX100 RD and a Campagnolo Veloce 53/39 crankset. I was looking up some specs for the derailleur and found this on bikepro.com:
The maximum rear sprocket for this derailleur is 28 teeth, while the minimum is 12 teeth. The greatest difference in size between the two front chainwheels can't exceed 13 teeth and the Total Capacity for this derailleur is 28 teeth.
The tooth difference of my crankset is 14. Will that extra tooth really make a difference?