- Alivio M3100 series shifters - 2x9 and 3x9 options enable a variety of riding styles - 2-speed front shifter uses single-paddle Rapidfire Plus Mono technology for the most simple & intuitive front shifting - Rapidfire Plus rear shifter mechanism allows up to 3 downshifts at once - Easy to read optical gear display - Optislick cables included - Pairs of shifters also include SP-41 cable housing