- Shiftable guide for SRAM and Shimano 2X cranks - Patented removable skid - Dual 9t sealed-bearing pulley design for superior chain management - BB, ISCG and ISCG-05 mounting options, 136g

- Replacement roller kits for mrp guide systems (includes bearings and hardware) - Lightweight version averages 20g less per roller (with hardware)