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Shimano SM-CRM66 chainring for Deore M6100 crankset family
The SM-CRM66 runs on Shimano Direct Mount, making it a fit for the full Deore M6100 crankset family including FC-M6100, FC-M6120, and FC-M6130. The Dynamic Chain Engagement+ tooth profile uses alternating geometry to improve chain engagement precision and retention across 12 speeds, with the kind of chain security a 1x drivetrain needs when terrain is loose, rooty, or unpredictable.
What Our Gearhead® Experts Are Saying:
"On an M6100-family crank this is a clean, no-adapter swap. The DCE+ tooth profile does real work on technical singletrack, because chain retention stays consistent through the chatter and the engagement feels positive coming out of rock gardens where a standard narrow-wide ring starts to struggle."
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
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Deore BR-M6200 2-Piston Disc Brake Caliper
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Deore CS-M6200 12-Speed Cassette
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Deore M6200 4-Piston Disc Brake
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Deore MT520 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
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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.