This Q-Rings will fit to Shimano Ultegra R7000 and 6700 series COMPACT cranks. Some other cranks may also require these rings.
This outer Q-Ring has arches to make clearance for the Drive side crank arm. This ring has Optimum Chainring Positioning number 3 only (OCP3).
ROTOR recommend that this ring is paired with the standard inner 39t Q-Ring is a standard Q-Ring (purchased separately).