The STONE SR3-3OF-HP is a high-strength SRAM-style 3-bolt direct mount MTB chainring designed for modern mountain bike drivetrains. Made from premium 7075-T651 aluminum alloy, it offers excellent stiffness, durability and precise chain engagement.
Available in two versions:
- With Bash Guard Version: 30T / 32T / 34T / 36T
- Without Bash Guard Version: 30T / 32T / 34T / 36T / 38T / 40T
The chainring features a 3mm inward offset, CNC machining, anodized surface treatment and optional removable bash guard design for better chainring protection on rough terrain.
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 helps protect the chainring teeth from impacts, rocks and obstacles while maintaining a clean and functional setup.
This version is available up to 36T maximum.
Key Features — With Bash Guard Version
1. Removable Bash Guard Design
The bash guard uses a detachable design, allowing riders to install or remove it according to riding needs.
It provides additional protection for the chainring 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 high strength and hardness.
The T651 treatment helps reduce internal stress after machining, improving flatness and reducing 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: 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 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 helps match SRAM-style mountain bike direct mount cranksets and maintain 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: 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.
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. This material provides high strength, high hardness and excellent durability for mountain bike use.
Reduced Machining Deformation
T651 heat treatment and pre-stretching help 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. You can 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.
