ROTOR Q-Ring chainrings for the Aldhu modular crank system in two versions. This can either bolt to the Aldhu 110x4bcd spider or Shimano-compatible 110x4 cranks, 9100 and R8000 series.When you combine these rings with the Aldhu spider, you can dial the rings into OCP (Optimal Chainring Position) #1-5. If you combine these rings with a Shimano or Shimano-compatible spider, you're locked into OCP #3, This position is the most commony used OCP, applicable to over 90% of riders.ROTOR 44T Q-rings for Aldhu cranks and Shimano 9000 R8000 chainrings available from Velotech Services