FSA Pro Road Chainring

30T (5x74mm BCD) :

– Steel inner ring for triple cranks
– N-10 rings are compatible with all 9/10 spd drivetrains

39T (5x130mm BCD) :

– CNC machined AL7075/T6
– Shifting ramps for centre ring only (triple)
– Stainless steel pins
– N-10 rings are compatible with all 9/10 spd drivetrains

42T (5x130mm BCD) :

– CNC machined AL7075/T6
– Shifting ramps for centre ring only (triple)
– Stainless steel pins
** S-9 is compatible with all 9 spd drivetrains

53T (5x130mm BCD) :

– 7075/T6 Aluminum
– Shifting ramps & stainless steel pins

N-11 rings are compatible with all drivetrains listed below:
– Shimano 10/11spd
– SRAM 10/11spd
– Campy 10spd
– Shimano 9spd (if you bump the outside ring out with a 0.2mm spacer; item # 920-0060)