Stone 100BCD Round Narrow-Wide Chainring for Shimano SLX M7100/M7120/M7130 & XT M8100/M8120/M8130 MTB Cranksets, 32T–48T
Overview
This Stone 100BCD round narrow-wide chainring is designed for Shimano SLX M7100 / M7120 / M7130 and XT M8100 / M8120 / M8130 MTB cranksets, and is available in tooth counts from 32T to 48T.
Before You Order
- Special BCD100 specification: Shimano original chainrings come in two different specifications that look identical. If your original chainring is 28T or 30T, this chainring is not compatible.
- T15 Torx wrench required: The original chainring bolts require a T15 Torx wrench to remove. Please test whether your original chainring can be disassembled before ordering. If it can be removed successfully, you can order this replacement chainring.
- Bolts not included: Only the chainring is provided. Chainring bolts must be purchased separately.
Product Description
This Stone 100BCD round chainring is built for Shimano 12-speed MTB cranksets with 100BCD mounting. Machined from high-strength 7075-T651 aluminum alloy with precise CNC processing, it delivers excellent stiffness, durability, and dependable performance for 1x MTB drivetrain setups.
The narrow-wide tooth profile improves chain retention and helps reduce chain drop on rough terrain for smooth, stable riding. It suits 9 / 10 / 11 / 12-speed chains and is compatible with Shimano 12-speed chains and SRAM MTB 12-speed chains.
Compatibility
Compatible Crankset Models
| Brand | Crankset Models |
|---|---|
| Shimano SLX | M7100 / M7120 / M7130 |
| Shimano XT | M8100 / M8120 / M8130 |
Not Compatible With
- Shimano Deore M5100
- Shimano Deore M6100
- Any other cranksets not listed above
Please confirm your crankset model before purchase.
Specifications
| Brand | Stone |
|---|---|
| BCD | 100BCD |
| Shape | Round |
| Material | Aluminum 7075-T651 |
| Material Hardness | HB150 |
| Thickness | 4mm |
| Finish | Black anodized |
| Surface Treatment | Anodizing |
| Processing | High-speed CNC machining |
| CNC Precision | 0.03mm |
| Tooth Profile | Narrow Wide |
| Tooth Options | 32T / 34T / 36T / 38T / 40T / 42T / 44T / 46T / 48T |
| Chain Compatibility | 9 / 10 / 11 / 12-speed chains (compatible with Shimano 12-speed chains and SRAM MTB 12-speed chains) |
| Drivetrain Use | 1x only |
| Front Shifting | Not supported |
Important Note
This is a narrow-wide chainring designed for 1x drivetrain systems only. It cannot be used as a 2x chainring and does not support front derailleur shifting.
Shimano 12-Speed Road Chain Quick Link Notice
If you use a Shimano 12-speed road bike chain, please replace the original Shimano 12-speed road quick link with another brand 12-speed quick link, such as KMC, YBN, SUMC, or similar.
The original Shimano 12-speed road quick link may be too narrow and may affect compatibility.
Size / Max Diameter / Weight
| Tooth Count | Max Diameter | Weight |
|---|---|---|
| 32T | 138mm | 52g |
| 34T | 145mm | 58g |
| 36T | 154mm | 60g |
| 38T | 162mm | 66g |
| 40T | 170mm | 72g |
| 42T | 178mm | 79g |
| 44T | 186mm | 88g |
| 46T | 194mm | 96g |
| 48T | 202mm | 105g |
Features
- Designed for Shimano 100BCD MTB cranksets
- Narrow-wide tooth design for improved chain retention
- Helps reduce chain drop during off-road riding
- Suitable for 1x MTB drivetrain setups
- Supports 9 / 10 / 11 / 12-speed chains
- Compatible with Shimano and SRAM MTB 12-speed chains
- High-strength 7075-T651 aluminum alloy construction
- CNC-machined with 0.03mm processing accuracy
- Black anodized finish for improved durability and corrosion resistance
- Lightweight, strong, and reliable for mountain bike riding
Package Includes
- 1 x Chainring
Bolts are not included. Please use the original crankset bolts for installation.
