Stone 104BCD Round Narrow-Wide Chainring for Shimano & SRAM 1x MTB Cranksets (32T–50T)
The Stone 104BCD round MTB chainring (narrow-wide) is designed for Shimano M590, M610, M615, M670, M675, M770, M785, M780, M970, M980, M820, and M430 cranksets, as well as SRAM X0, X5, X7, X9, and XF. It is available in 32T–50T.
Product Description
This Stone 104BCD round chainring is built for 104BCD MTB cranksets. It is machined from high-strength 7075-T651 aluminum alloy using precision CNC processes, delivering excellent stiffness, durability, and dependable performance for 1x drivetrain setups.
The narrow-wide tooth profile improves chain retention and reduces chain drop on rough terrain, giving you a smooth, stable ride. It is well suited to mountain biking, 1x drivetrain conversions, and riders looking for a lightweight, long-lasting replacement chainring.
Compatibility
- BCD: 104BCD
- Shape: Round
Chain Compatibility
- MTB chains: 9 / 10 / 11 / 12-speed
- SRAM road bike chains: 9 / 10 / 11-speed
- Shimano road bike chains: 9 / 10 / 11 / 12-speed
Not Compatible With
- SRAM AXS 12-speed Flattop chains
- SRAM T-Type 12-speed chains
If you need a tooth shape for SRAM AXS/T-Type Flattop chains, buy here.
The narrow-wide tooth design is for 1x drivetrains only. It cannot be used as a 2x chainring and does not support front derailleur shifting. Please confirm your crankset BCD and mounting type before purchase.
Compatible Cranksets
| Brand | Compatible Cranksets |
|---|---|
| Shimano | M590, M610, M615, M670, M675, M770, M785, M780, M970, M980, M820, M430 |
| SRAM | X0, X5, X7, X9, XF |
Important Note
This is a narrow-wide chainring designed exclusively for 1x drivetrain systems. 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, replace the original Shimano 12-speed road quick link with another brand’s 12-speed quick link, such as KMC, YBN, SUMC, or a similar compatible brand. The original Shimano 12-speed road quick link may be too narrow and can affect compatibility.
Specifications
| Brand | Stone |
|---|---|
| BCD | 104BCD |
| Shape | Round |
| Material | High-strength 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 |
| Drivetrain use | 1x only |
| Front shifting | Not supported |
| Available teeth | 32T / 34T / 36T / 38T / 40T / 42T / 44T / 46T / 48T / 50T |
Size / Max Diameter / Weight
| Size | Max Diameter | Weight |
|---|---|---|
| 32T | 138mm | 39g |
| 34T | 146mm | 51g |
| 36T | 154mm | 57g |
| 38T | 162mm | 61g |
| 40T | 170mm | 71g |
| 42T | 178mm | 77g |
| 44T | 186mm | 86g |
| 46T | 194mm | 102g |
| 48T | 202mm | 108g |
| 50T | 210mm | 119g |
Features
- Designed for 104BCD MTB cranksets
- Round chainring design for stable power transfer
- Narrow-wide tooth profile for improved chain retention
- Helps reduce chain drop during off-road riding
- Suitable for 1x MTB drivetrain setups
- Compatible with 9 / 10 / 11 / 12-speed MTB chains
- Made from high-strength 7075-T651 aluminum alloy
- CNC-machined with 0.03mm processing accuracy
- Black anodized finish for better durability and corrosion resistance
- Lightweight, strong, and reliable for mountain bike use
Package Includes
- 1 x Chainring
- 4 x Chainring bolts
