*Shims - Included with rings. For 2x crank conversions; shims between the crank and ring get you back to an ideal 49-50mm chainline. For 3x crank conversions; shims under the bolt heads allow reuse of your 3x hardware.
Material: 7075-T6 Aluminum
Weight: 43g (30T), 49g (32T), 58g (34T)
Compatibility: all symmetrical 4 arm 94 mm BCD cranks (SRAM XO1, X1, GX), all symmetrical 4 arm 96 mm BCD cranks (Shimano compact triple M782, M672, M622, M612)
SRAM chainrings usually have the BCD laser etched on the back of the ring
If your Shimano 3x crank has a 30T middle ring this is the 1x ring you need. Shimano crank part numbers are usually laser etched on the pedal end of the crank on the back face.