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 pinsN-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)
