Shimano Deore SM-CRM66 Chainring – 30T, 12-Speed Direct Mount
The Shimano Deore SM-CRM66 is a 30-tooth chainring designed for 12-speed drivetrains, engineered for reliable shifting performance in mountain and hybrid applications.
30 teeth deliver a balanced gear ratio for versatile terrain coverage
Direct Mount installation ensures secure, rigid attachment to the crankset
Steel construction provides durable wear resistance across long rides
Optimised for 1×12-speed setups with single-chainring configurations
What sets the SM-CRM66 apart
The Direct Mount interface eliminates the need for separate mounting hardware, simplifying installation and ensuring consistent chain alignment. The 30-tooth tooth count is tuned for smooth cadence in both climbing and flat riding scenarios.
Ideal for...
Mountain bikers and hybrid riders running a 1×12-speed drivetrain who need a reliable replacement or spare chainring. The 30-tooth size suits riders who prioritise a wide gear range without frequent chain drops.
Application of the Shimano SM-CRM66
Remove the existing chainring from the crankset
Clean the Direct Mount interface on the crank arm
Align the SM-CRM66 chainring with the mounting points
Secure according to Shimano torque specifications
Verify chain alignment and shifting performance before riding
Shimano is a Japanese manufacturer specialising in cycling components, including drivetrain parts, brakes, and derailleurs. The Deore line is a well-established mid-range groupset known for reliable performance in mountain and hybrid riding. Founded in 1921, Shimano is one of the largest cycling component manufacturers worldwide.
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