How good is the s works tarmac disc di2 in its first season it won two grand tours and a world championshipnot too shabby by mating its rider first engineered design that ensures peak performance across every size frame with the legendary performance of the dura ace di2 11 speed build kit and the incredible stopping power of shimano hydraulic disc brakes youll have impeccable performanceno matter if the road is going up or down if youre looking for the ultimate in complete road bike pe