SHIMANO XT SM-CRM85 1x Chainring for M8100 and M8130 Cranks
- 36 tooth chainring
- Direct mount style
- For M8100 and M8130 1x cranks
- Dynamic Chain Engagement+ tooth profile
- Aluminum, black
- 3.2 ounces item weight
Last refreshed Oct 3, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A larger single chainring for the matching XT cranks, made of aluminum with a tooth shape meant to hold the chain. It fits only the cranks Shimano names, so confirm yours before ordering.
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ASIN: B07VH16QBBModel: ISMCRM85A6Category: Chainrings
Sizes Available
Need a different one? Pick on Amazon →
Overview
Not a complete crankset, this is a replacement ring for Shimano XT one by cranks. It mounts directly to the crank arm, and its tooth profile is shaped for mountain bike chain engagement.
A bigger ring raises the top gear for riders who spin out, and the tooth profile is made to help retention. Aluminum holds the weight low. The limitation is fit, as it works only on the named cranks, and the listing says nothing about bolts or a wear life.
Who it's for
XT crank owners running a single ring who want a different gear ratio or a fresh ring. Riders with other brands of cranks, or two ring setups, will need a different part.
Pros and cons
- Direct mount, no spider needed
- Tooth shape aids chain retention
- Fits matching XT cranks
- Fits only the named cranks
- Bolts not mentioned
- Wear life not stated
Performance notes
Tooth count sets the gear ratio against the cassette, so a bigger ring pushes the whole range higher. The tooth profile engages each chain link firmly, reducing the chance of the chain dropping on rough trails. A direct mount ring attaches straight to the crank, so it must match the crank interface.
Where it stands among chainrings
- #7 most-searched brand and model of the 9 chainrings lines we track (by search demand, not sales).
From the specs of the 15 chainrings we list; not a test result.
Specifications
| Model | ISMCRM85A6 |
|---|---|
| Dimensions & fit | |
| Size | 36T |
| Item weight | 3.2 ounces |
| Construction & materials | |
| Material | Aluminum |
| Color | Black |
| Warranty & support | |
| Warranty Description | Limited warranty |
| Other details | |
| Style | Direct mount |
| Suggested Users | Unisex adult |
Frequently asked questions
Which cranks does the Shimano XT SM-CRM85 fit?
Shimano's M8100 and M8130 1x cranksets, according to the description.
Is the Shimano XT SM-CRM85 a complete crankset?
No. It is a replacement 1x chainring.