I signed up for an August ride that is 190 miles and some hilly. I ride a stock Roubaix compact with the following setup:
50 x 34t (front)
Shimano 105, 10-speed, 12-27t (rear)
The shifters are SRAM Rival.
I want to 'eek' out every little bit of climbing ability by switching out the rear cassette and derailleur. Possibly something from the MTB range? My biggest question is what is compatible with SRAM Rival "Double Tap" shifters?
I realize the bike is already a 'compact ' setup but I also ride a Trek Fx and find it so much easier on hills even though its a much heavier bike. There must be a cassette that I can switch in to give me a little bit of a boost. I dont want to spend a fortune as its more an experiment than anything.