ROTOR Round Chainring 12s/11s for Shimano 4-Bolt

Compatible with SRAM 11s

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.