E-Thirteen Helix 12 Speed Race Cassette - XD Driver - Grey - 9-50T - 12 Speed Heavy/Bulky Chain retention:Adjustable slider with co-molded

Chain retention:Adjustable slider with co-molded soft rubber for sound reduction

Re-tightening your headset becoming a common problem

The AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses and the VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial

but that's about it

E-Thirteen Helix 12 Speed Race Cassette - XD Driver - Grey - 9-50T - 12 Speed Heavy/Bulky Chain retention:Adjustable slider with co-moldedThe HELIX R Cassette is an upgrade to any SRAM Eagle or Shimano drivetrain, with more range than any other cassette on the market. The 9 tooth cog lets you step down one chainring size while keeping the same top end gearing and provides not only better ground clearance but an overall lighter drivetrain. The improved tooth profile of the Helix cassette's features Shimano 12 speed level shifting performance with the improved reliability of a steel and