STONE 5mm Offset Direct Mount Chainring for E*Thirteen E13 Carbon Cranks (30T–40T)
The STONE 5mm Offset Direct Mount Chainring is built for E*Thirteen / E13 carbon cranksets, including the LG1 Race, TRS Race, XCX Race Mountain, and XCX Race Gravel models.
It shares the same 5mm offset as the original E13 UL-5mm chainring, making it the correct choice for Boost specification frames. Machined from high-strength 7075-T651 aluminum, it combines stiffness, durability, and dependable chain retention for MTB, gravel, and off-road riding.
Note: The original E13 chainring is offered in two offsets — UL-5mm and CL-8mm. This STONE chainring is the 5mm version for Boost frames, so please confirm your original chainring’s offset before ordering.
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 chains) |
| Crank compatibility | 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 fits the following E*Thirteen / E13 carbon cranksets:
- LG1 Race Carbon cranks
- TRS Race Carbon cranks
- XCX Race Mountain Carbon cranks
- XCX Race Gravel Carbon cranks
It is designed as a direct replacement for the original E13 UL-5mm offset chainring.
Important Notice
The original E13 chainring comes in 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 suits Boost spec frames. Please verify your original chainring’s 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
High-Strength 7075-T651 Aluminum
Machined from 7075-T651 high-strength aluminum, the chainring delivers consistent mechanical performance under demanding riding conditions:
- High stiffness
- Strong durability
- Lightweight structure
- Good wear resistance
- Reliable long-term performance
Precision CNC Machining
Each chainring is produced by high-speed CNC machining with a working accuracy of 0.03mm, which ensures:
- Accurate crank fitment
- Smooth chain engagement
- Stable drivetrain performance
- Consistent riding quality
Narrow-Wide Tooth Design
The narrow-wide tooth profile improves chain retention and reduces the chance of chain drop on rough terrain, while supporting smoother chain engagement and better drivetrain stability.
Package Includes
- 1 × STONE Direct Mount Chainring
