E*thirteen Helix R Guidering (3mm Offset)3-Bolt 32t - Bronzee*thirteen Helix R Guidering 32t 11 12 Speed 3mm Offset SRAM 3 Bolt DM Bronze. Helix R SRAM Direct Mount Chainrings offer a true upgrade solution for SRAM 3 Bolt MTB crank users (including DUB) to achieve cross compatibility with both SRAM and Shimano 11 and 12 speed drivetrains. Forged from 7075 T7 aluminum then extensively CNC optimized for industry leading weights and a unique high end full CNC aesthetic 3mm offset (Boost chainline) Compatible with