Hi I bought a cyclocross TCX1 by Giant and it has the complete Sora set by Shimano. I'm looking to replace two of the components with Ultegra.
Now, in your opinion, which 2of the 7 components
(Chains, crankset, Front Deraulier, Rear Deraulier, Shifters, Brakes, Cassette Set) makes the most difference when riding?
Actually if you can, I'd be more happy if you listed all 7 (1 being best, 7 being least)