STONE / STONEDW 29mm DUB 8-Bolt Direct Mount MTB Crankset
A precision-machined MTB crankset designed for 29mm DUB systems, 8-bolt direct mount components, and high-strength mountain bike use.
Compatibility
- for MTB / mountain bike frames
- for 29mm DUB bottom bracket systems
- for SRAM AXS T-Type drivetrains
- for XPLR 12s / 13s setup
- Crank Parameters compatible to SRAM XX1
- for 8-bolt direct mount chainrings, spiders, and power meters
Not Compatible With
- not for Shimano Hollowtech II 24mm bottom brackets.
- not for 3-bolt direct mount chainrings, spiders, or power meters.
- not for non-DUB bottom bracket systems without a compatible adapter.
Spindle Length Options
- 128mm spindle: standard option (default shipment)
- 134mm spindle: wide option (available upon request)
- 143mm spindle: DH option (available upon request)
*Please contact us before ordering if you need a 134mm or 143mm spindle.
Bottom Bracket Setup Reference
- 128mm spindle: for BSA 68-73mm bottom brackets.
- 134mm spindle: for BSA 68-73mm bottom brackets, add 2pcs 3mm spacers on the outer side.
- 143mm spindle: for BSA 83mm bottom brackets.
Size and Weight
- 150mm / 534g (18.8oz)
- 155mm / 538g (19oz)
- 160mm / 555g (19.6oz)
- 165mm / 559g (19.7oz)
- 170mm / 569g (20.1oz)
- 175mm / 579g (20.4oz)
Weight may vary slightly due to production batches and spindle length.
Product Specifications
- Brand: STONE / STONEDW
- Model: 8-Bolt Direct Mount MTB Crankset
- Spindle Diameter: 29mm DUB
- Chainline: 52mm
- Q-Factor: 168mm
- Offset: 3mm inward
- Interface: 8-bolt direct mount
- Crank Length: 150mm / 155mm / 160mm / 165mm / 170mm / 175mm
- Color: Black / Silver
- Surface Finish: Anodized
- Crank Arms: 7050-T7451 Aluminum
- Other Components: 7075-T651 Aluminum
Precision Manufacturing
- In-house CNC machining for stable production quality.
- Renishaw probing system for in-process measurement.
- Automatic compensation helps improve machining accuracy.
- Designed for accurate centering and tight tolerance control.
- Consistent quality across production batches.
Spindle Precision
- High-strength aluminum alloy spindle.
- High roundness and geometric accuracy.
- Spline interface symmetry tolerance: ≤ 0.015mm.
- Spindle roundness tolerance: ≤ 0.01mm.
- Designed for smooth engagement and long-term durability under high torque.
Fatigue Testing
- Passed multi-configuration fatigue testing.
- 45° / 1800N / 100,000 cycles.
- 30° / 1800N / 100,000 cycles.
- Structure optimized through long-term testing for better strength and durability.
Package Includes
- Right crank arm × 1
- Left crank arm × 1
- Spindle × 1
- Pedal washers × 2
- 3mm spacer × 1
- 8-bolt mounting bolts × 8
- Grease × 1
Installation Notice
- Please confirm your bottom bracket, chainline, frame clearance, and drivetrain before purchase.
- Use only compatible 8-bolt direct mount chainrings, spiders, or power meters.
- Professional installation is recommended.
Default shipment: 128mm spindle. Please contact us before ordering if you need a 134mm or 143mm spindle.
