no funtional difference. both shifters have the exact same internals, the only diff is the material the shift paddle is made with, aluminum on rival, magnesium on force. go w/ rival unless you can find a screamin' deal on force, and then get some really nice tires (tubulars if you're racing).
A forum community dedicated to Road Bike owners and enthusiasts. Come join the discussion about bike parts, components, deals, performance, modifications, classifieds, troubleshooting, maintenance, and more!