The STONE 5mm Offset Direct Mount Chainring is designed for E*Thirteen / E13 carbon cranksets, including LG1 Race, TRS Race, XCX Race Mountain, and XCX Race Gravel models.
This chainring uses the same offset as the original E13 UL-5mm chainring, making it suitable for Boost specification frames. Made from high-strength 7075-T651 aluminum, it provides excellent stiffness, durability, and reliable chain retention for MTB, gravel, and off-road riding.
The original E13 chainring has two specifications, one is UL-5mm offset, one is CL-8mm offset. Stone chainring is 5mm offset,can fit for boost spec frames.
Specifications
| Item | Details |
|---|---|
| Brand | STONE |
| Material | High-strength Aluminum 7075-T651 |
| Material Hardness | HB150 |
| Color | Black anodized |
| Mount Type | Direct Mount |
| Offset | 5mm |
| Thickness | 9mm |
| Speed Compatibility | 9 / 10 / 11 / 12-speed standard chains （Not for flattop or T-type chain） |
| Crank Compatibility | For E*Thirteen / E13 LG1 Race Carbon, TRS Race Carbon, XCX Race Mountain Carbon, XCX Race Gravel Carbon |
| Surface Treatment | Anodized, high-speed CNC finish |
| CNC Precision | 0.03mm |
| Tooth Options | 30T / 32T / 34T / 36T / 38T / 40T |
Compatibility
This chainring is compatible with the following E*Thirteen / E13 cranksets:
- For LG1 Race Carbon Cranks
- For TRS Race Carbon Cranks
- For XCX Race Mountain Carbon Cranks
- For XCX Race Gravel Carbon Cranks
It is designed as a replacement for the original E13 UL-5mm offset chainring.
Important Notice:
The original E13 chainring has two offset specifications:
| Original E13 Version | Offset | Compatibility Note |
|---|---|---|
| UL Version | 5mm offset | Compatible with this STONE chainring |
| CL Version | 8mm offset | Not the same offset as this chainring |
This STONE chainring is 5mm offset and is suitable for Boost spec frames. Please confirm your original chainring offset before ordering.
Size & Weight
| Teeth | Max Diameter | Weight |
|---|---|---|
| 30T | 130mm | 63g |
| 32T | 138mm | 68g |
| 34T | 146mm | 71g |
| 36T | 154mm | 75g |
| 38T | 162mm | 79g |
| 40T | 170mm | 85g |
Weight may vary slightly due to manufacturing tolerances.
Product Advantages
1. High-Strength 7075-T651 Aluminum
Made from 7075-T651 high-strength aluminum, this chainring offers excellent mechanical performance for demanding riding conditions.
- High stiffness
- Strong durability
- Lightweight structure
- Good wear resistance
- Reliable long-term performance
2. Precision CNC Machining
Each chainring is produced using high-speed CNC machining with a working accuracy of 0.03mm.
This ensures:
- Accurate crank fitment
- Smooth chain engagement
- Stable drivetrain performance
- Consistent riding quality
3. Narrow-Wide Tooth Design
The narrow-wide tooth profile helps improve chain retention and reduce the chance of chain drop during rough riding.
It also supports smoother chain engagement and better drivetrain stability.
Package Includes
- 1 × STONE Direct Mount Chainring
