e*Thirteen Helix Race 12-Speed Cassette - Black Variant:9-52T The most responsive

The most responsive

Never miss a turn with voice turn-by-turn cues

Use indoors or outdoors

Mineral oil won't harm painted finishes

e*Thirteen Helix Race 12-Speed Cassette - Black Variant:9-52T The most responsiveHELIX RACE 12 SPEED CASSETTE MOST RANGE. CROSS COMPATIBLE. e*thirteen expanded drivetrain possibilities for every rider with our original 9 50T Helix Race Cassette with 533% gear range. Our proprietary 9t sprocket and patented two piece construction gave riders an unprecedented ability to build the drivetrain of their choice. Now, weve built on that winning formula and added a 52T sprocket for an eye watering 578% total range. Love to grind climbs?