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Shimano SM-CRM66 12-speed MTB chainring for Deore builds
The SM-CRM66 is Shimano's 12-speed direct mount chainring for the Deore M6100 crankset family, built around the Dynamic Chain Engagement+ tooth profile that improves chain pickup and retention on rough and loose terrain. The alternating tooth geometry grips the chain more positively on each revolution, reducing the skipping and chain slap that single-ring setups encounter when the trail gets unpredictable.
What Our Gearhead® Experts Are Saying:
"The direct mount interface makes this a straightforward swap on any M6100-family crank. There's no BCD to match, no spider to source. I size up or down based on where I'm riding, and the DCE+ tooth profile keeps the chain where it belongs through the rough stuff."
Details
- 12-speed 1x chainring for Deore M6100 cranksets
- Dynamic Chain Engagement+ improves chain retention on rough terrain
- Direct mount interface simplifies sizing swaps
- No chain guard for clean 1x-specific installation
- Item #SHIU32I
- Number of Rings
- 1
- Teeth
- 30t, 32t
- Connection
- Direct Mount
- Compatible Components
- 12-speed drivetrains
- Manufacturer Part Number
- SM-CRM66
- Includes
- 1 chainring
- Activity
- trail, enduro
Shimano DEORE Components
Trail-Ready. No Batteries.
12-speed mechanical precision built for MTB trail riding
More Trail, Less Maintenance
Shimano DEORE combines mechanical simplicity with proven trail performance, delivering the durability and reliability serious trail riders depend on.
The DEORE MTB Lineup
Cranksets
DYNAMIC CHAIN ENGAGEMENT+ keeps the chain seated and shifting cleanly through the roughest terrain.
Cassettes
HYPERGLIDE+ tooth profiles deliver fast, smooth shifting under load across a 10-51T range.
Rear Derailleurs
SHADOW chain stabilization and a steel pulley cage deliver trail-durable shifting across every condition.
Shifters
Redesigned lever geometry with a shorter stroke, wider paddle contact, and 2-WAY RELEASE for faster, more natural shifting.
Brakes
Low-viscosity oil and progressive SERVO WAVE modulation deliver consistent, controlled braking across a wide temperature range.
Shop DEORE Components
Shimano
Deore BL-M6200 Disc Brake Lever
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Deore BR-M6200 2-Piston Disc Brake Caliper
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Deore BR-M6220 4-Piston Disc Brake Caliper
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Deore BR-MT600 2-Piston Disc Brake Caliper
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Deore BR-MT620 4-Piston Disc Brake Caliper
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Deore CS-M6200 12-Speed Cassette
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Deore CS-M7200 12-Speed Cassette
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Deore M6200 2-Piston Disc Brake
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Deore M6200 4-Piston Disc Brake
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Deore M6200 Crankset
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Deore MT520 Crankset
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Deore MT620 Crankset
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Deore RD-M6200 Rear Derailleur
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Deore RD-M7200 Rear Derailleur
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Deore RD-M7230 Rear Derailleur
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Deore SL-M6200 Shifter
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Deore SL-M6210 Shifter
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Deore SL-M6230 Shifter
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Deore SM-CRM66 1x Chainring
1 color
100+ Years in the Making
Founded in Japan in 1921, Shimano has spent over a century earning the trust of riders at every level. Their precision engineering and relentless drive to innovate have made Shimano components a fixture on trails and roads worldwide.