ROTOR Round Chainrings Shimano 12s/11s SRAM 11s Shimano 4-Bolt
50-34 ("compact"): If you ride a lot in the mountains.
52-36 ("semi-compact"): A great all-round combination – a customer favourite!
53-39 ("standard"): Great for flat riding, time-trialing, and very strong riders.
54-42 ("TT and Fast RR"): A perfect combination for those that want to Time Trial or want bigger gears for sprinting. Also available in a 54-39 combination.