These chainrings are for Shimano GRX cranks. They feature our patented Drop-Stop® design for the best wear life, chain retention, and mud clearance. Drop-Stop ST is specifically for the Shimano 12-speed Hyperglide+ chain, which is used by GRX 12-speed. Drop Stop-B works with all  other 9, 10, 11, and 12-spd chains, including SRAM Flattop.

Compatibility

• Aero chainring available in 46T. Sizes 38T and 42T are non-aero.
  
• Compatible with Shimano GRX 600 series cranksets (FC-RX600-1, FC-RX600-10, RX600-10, FC-RX610-1, FC-RX610-2). Also compatible with Shimano GRX 800 series cranksets (FC-RX810-1, FC-RX810-2, FC-RX820-1, FC-RX820-2).
  
• Drop-Stop ST is designed for Shimano 12-speed Hyperglide+ chains
  
• Drop-Stop B tooth profile is compatible with SRAM Flattop chain 
  
• Wolf Tooth’s patented Drop-Stop wide/narrow tooth profile provides the ultimate chain retention and mud-shedding ability