STONE SR3-3OF-HP 3-Bolt Direct Mount MTB Chainring: 7075-T651 CNC Aluminum, 3mm Offset, 30T–40T for SRAM GXP/DUB/Eagle Cranksets
The STONE SR3-3OF-HP is a high-strength SRAM-style 3-bolt direct mount MTB chainring built for modern mountain bike drivetrains. Machined from premium 7075-T651 aluminum alloy, it delivers excellent stiffness, durability and precise chain engagement.
Two versions are available:
- With Bash Guard: 30T / 32T / 34T / 36T
- Without Bash Guard: 30T / 32T / 34T / 36T / 38T / 40T
The chainring features a 3mm inward offset, precision CNC machining, an anodized surface and an optional removable bash guard for added chainring protection on rough terrain. It supports 9–12 speed standard chains and is not compatible with Flattop or T-type chains.
Version 1: With Bash Guard
STONE SR3-3OF-HP Chainring With Bash Guard
The With Bash Guard version is designed for riders who need extra protection during mountain biking, trail riding, enduro riding or technical terrain use. The removable bash guard shields the chainring teeth from impacts, rocks and obstacles while keeping the setup clean and functional.
This version is available up to 36T maximum.
Key Features — With Bash Guard Version
1. Removable Bash Guard Design
The bash guard is detachable, so you can install or remove it to suit your riding needs.
It provides additional protection during:
- Trail riding
- Enduro riding
- Rocky terrain
- Technical climbs
- Bike park riding
- Daily MTB use
The bash guard has an effective thickness of approximately 5mm.
2. High-Strength 7075-T651 Aluminum
The chainring is machined from imported AL7075-T651 aluminum alloy, known for its high strength and hardness. The T651 treatment reduces internal stress after machining, improving flatness and minimizing deformation.
3. CNC Machined and Anodized Finish
Each chainring is precision CNC machined for accurate fitment and stable performance. The anodized surface helps prevent oxidation and discoloration while improving durability for long-term outdoor use.
4. 3mm Offset Design
The chainring uses a 3mm inward offset design, suitable for SRAM-style MTB 3-bolt direct mount cranksets. The offset follows the SRAM-style calculation method and helps achieve proper chainline alignment.
5. Direct Mount Compatibility
Designed for SRAM mountain bike 3-bolt direct mount cranksets, including many SRAM Eagle, DUB, GXP and BB30 crank models.
Specifications — With Bash Guard Version
| Item | Specification |
|---|---|
| Brand | STONE |
| Model | SR3-3OF-HP |
| Type | 3-Bolt Direct Mount MTB Chainring |
| Version | With Bash Guard |
| Material | Imported AL7075-T651 Aluminum Alloy |
| Hardness | Approx. 150HB |
| Process | CNC Machining |
| Surface Treatment | Anodized |
| Offset | 3mm Inward Offset |
| Thickness | 12mm including bash guard |
| Bash Guard Thickness | Approx. 5mm effective thickness |
| Interface | SRAM-style 3-Bolt Direct Mount |
| Color | Anodized Black / Silver |
| Application | MTB / Trail / Enduro / XC / DIY Builds |
Size & Weight — With Bash Guard Version
| Teeth | Outer Diameter | Weight | SKU | Color |
|---|---|---|---|---|
| 30T | 130 mm | 104 g | SR3-30F-HP-30TY | Black / Silver |
| 32T | 138 mm | 115.5 g | SR3-30F-HP-32TY | Black / Silver |
| 34T | 146 mm | 119.6 g | SR3-30F-HP-34TY | Black / Silver |
| 36T | 154 mm | 128.4 g | SR3-30F-HP-36TY | Black / Silver |
Note: The with bash guard version is available up to 36T maximum.
Version 2: Without Bash Guard
STONE SR3-3OF-HP Chainring Without Bash Guard
The Without Bash Guard version is ideal for riders who prefer a lighter, cleaner and more minimal drivetrain setup. It keeps the same high-strength 7075-T651 CNC chainring design while reducing weight by removing the bash guard.
This version is available up to 40T maximum.
Key Features — Without Bash Guard Version
1. Lightweight Design
Without the bash guard, this version offers a lighter setup for riders who prioritize weight savings and simplicity.
It is suitable for:
- XC riding
- Marathon MTB
- Gravel-style MTB setups
- Commuting
- DIY upgrades
- General mountain biking
2. Premium 7075-T651 Aluminum
Made from imported AL7075-T651 aluminum alloy, the chainring provides excellent strength, hardness and durability. The material is heat-treated and pre-stretched to improve machining stability and reduce deformation.
3. Precision CNC Machining
The chainring is CNC machined from high-quality aluminum plate to ensure an accurate tooth profile, stable installation and reliable chain retention.
4. Anodized Anti-Oxidation Surface
The anodized finish helps protect the aluminum from long-term oxidation, fading and corrosion.
Available in:
- Black
- Silver
5. 3mm Inward Offset
The 3mm inward offset design matches SRAM-style mountain bike direct mount cranksets and maintains proper chainline performance.
Specifications — Without Bash Guard Version
| Item | Specification |
|---|---|
| Brand | STONE |
| Model | SR3-3OF-HP |
| Type | 3-Bolt Direct Mount MTB Chainring |
| Version | Without Bash Guard |
| Material | Imported AL7075-T651 Aluminum Alloy |
| Hardness | Approx. 150HB |
| Process | CNC Machining |
| Surface Treatment | Anodized |
| Offset | 3mm Inward Offset |
| Thickness | 6.7mm |
| Raw Plate Thickness | 8mm |
| Interface | SRAM-style 3-Bolt Direct Mount |
| Color | Anodized Black / Silver |
| Application | MTB / XC / Trail / Commuting / DIY Builds |
Size & Weight — Without Bash Guard Version
| Teeth | Outer Diameter | Weight | SKU | Color |
|---|---|---|---|---|
| 30T | 130 mm | 59.7 g | SR3-30F-HP-30TY | Black / Silver |
| 32T | 138 mm | 66.9 g | SR3-30F-HP-32TY | Black / Silver |
| 34T | 146 mm | 72.9 g | SR3-30F-HP-34TY | Black / Silver |
| 36T | 154 mm | 78.5 g | SR3-30F-HP-36TY | Black / Silver |
| 38T | 162 mm | 82.5 g | SR3-30F-HP-38TY | Black / Silver |
| 40T | 170 mm | 86.6 g | SR3-30F-HP-40TY | Black / Silver |
Note: The without bash guard version is available up to 40T maximum.
Compatibility
The STONE SR3-3OF-HP is designed for SRAM-style mountain bike 3-bolt direct mount cranksets. It supports 9–12 speed standard chains and is not compatible with Flattop or T-type chains.
Compatible with many SRAM crank models, including:
- SRAM XX1
- SRAM XX1 Eagle
- SRAM X01
- SRAM X01 Eagle
- SRAM GX Eagle
- SRAM X1-1400
- SRAM GX-1400
- SRAM S-2210
- SRAM X0
- SRAM X9
- SRAM S1400
- GXP 24mm axle cranksets
- Long spindle BB30 30mm axle cranksets
- Newer SRAM DUB axle cranksets
Please check your crank interface before ordering. This product is for SRAM-style 3-bolt direct mount cranksets.
Installation Notes
Bolt Interface
- Interface: 3-bolt direct mount
- Recommended torque: 6–8 Nm
- Tool: T25 Torx wrench
- Crank bolt tool may require: T30 Torx wrench
- Use original bolts or suitable replacement bolts
Important
Please verify your crank interface size before installation. Incorrect installation may cause poor chainline, abnormal wear or drivetrain noise.
Product Advantages
High Strength 7075-T651 Aluminum
The chainring is made from premium 7075-T651 aluminum plate, providing high strength, high hardness and excellent durability for mountain bike use.
Reduced Machining Deformation
T651 heat treatment and pre-stretching reduce internal stress in the aluminum plate. This improves flatness after CNC machining and reduces chainring runout.
Removable Bash Guard Option
The removable bash guard version gives riders more flexibility — choose a protected setup for rough terrain, or a lighter setup without the bash guard.
Multiple Teeth Options
The product covers a wide range of chainring sizes:
- With bash guard: 30T–36T
- Without bash guard: 30T–40T
This makes it suitable for racing, commuting, trail riding, DIY builds and off-road riding.
