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50-34 ("compact"): If you ride a lot in the mountains.
52-36 ("semi-compact"): A great all-round combination – a customer favorite!
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.