12T. Narrow Wide tooth profiling ensures ultimate chain retention. Composite material provided by EMS Swiss with 40% glass-fibre mixture. RollerBoys equipped with low friction ceramic bearings for ultra-smooth glide and exceptional durability. Lubricated with special ceramic light oil for extra smoothness. Compatibility: Sram. Material: Grivory EMS.
Best Price: £29.99 from Merlin Cycles