Engineered for precision, fatigue resistance, and long-term structural reliability.
Brand: STONE / STONEDW
Model: 8-Bolt Direct Mount Road MTB Bike Crankset
Spindle Diameter: 29mm DUB (28.99mm)
Chainline: 52mm
Offset: inner 3mm
Direct mount interface: 8 bolts direct mount, which compatible to 8 bolts chainring and spider and powermeter from any brand. XPLR 12s 13s. T-type XX1
Crank Parameters compatible to XX1.
Crank length: 150mm/ 155mm/160mm/165mm/170mm/175mm
Color: Black, Silver
Anodized surface.
Crank Arm Material: 7050-T7451 Aluminum Alloy (7050 aluminum alloy offers excellent fatigue resistance. It help this crank pass the fatigue test of 100,000 times)
Other Components Material: 7075-T651 Aluminum Alloy(7075 aluminum alloy provides an excellent strength-to-weight ratio and high overall strength.)
Works with MTB bike, Mountain bike.
Q-factor: 168mm
Weight:
150mm
155mm
160mm
165mm /559g (19.7oz)
170mm / 569g (20.1oz)
175mm / 579g (20.4oz)
In-House CNC Machining & Quality Control
Equipped with Renishaw probing system
Renishaw probing systems provide in-process measurement and automatic compensation, ensuring high precision and repeatable CNC machining.
All machining completed fully in-house
Full control over machining accuracy and consistency
Ensures accurate centering and tight tolerance control
Guarantees consistent quality across production batches
Precision Spindle Engineering
High-strength aluminum alloy spindle
Extremely high roundness and geometric accuracy
Spline interface symmetry tolerance ≤ 0.015 mm
Spindle roundness tolerance ≤ 0.01 mm
Ensures smooth engagement and long-term durability under high torque
Package Content:
Right crank arm x1, Left crank arm x1, Spindle x1, Pedal washers x2, 3mm spacers x1, 8pcs bolts, Grease x1
Advantage:
1.In-house CNC Machining with Renishaw Probing
Ensures precise centering, tight tolerances, and consistent quality.
High-strength Aluminum Alloy spindle, it features extremely high roundness.
Spline interface symmetry tolerance≤0.015 mm
Roundness tolerance≤0.01 mm
2.Multi-configuration Fatigue Testing, Pass fatigue test 100,000 times
Mechanical performance tested across multiple crank configurations.
3.Long-term Testing & Structural Optimization
Design refined through months of fatigue testing for improved strength and durability.
4.Competition-grade certification passed
45°/ 1800 N / 100,000 times
30°/ 1800 N / 100,000 times
Made from premium 7075 and 7050 aluminum alloys sourced from U.S. suppliers such as Aleris and Aleco,the crank is manufactured with exceptionally high processing standards and precision.
Manufacturing Philosophy
Manufactured from premium 7050 and 7075 aluminum alloys
Aluminum sourced from U.S. suppliers such as Aleris and Aleco
Machined with exceptionally high processing standards
Focused on engineering integrity rather than marketing claims
Designed for riders who value precision, durability, and long-term performance
