The QO ROCKS 38T Chainring is meticulously engineered for dedicated mountain bikers who demand precision, durability, and optimal power delivery on technical trails and enduro stages. Developed as part of the high-performance QO ROCKS MTB component range, this chainring is purpose-built to handle the aggressive demands of modern off-road riding, where chain security, direct power transfer, and reliable shifting are critical for performance and safety.
At the heart of its design is a 38-tooth configuration, carefully selected to provide the ideal balance between climbing efficiency and high-speed stability on descents. In trail and enduro applications, where riders encounter constant shifts in gradient and terrain, this chainring size offers a versatile gear ratio that enables confident technical climbs without compromising cadence and control on fast, rugged descents. The 38T size is particularly favored by experienced enduro riders seeking a middle ground between torque and top-end speed, making it suitable for a wide range of course profiles.
The direct-mount interface is one of the defining features of the QO ROCKS 38T Chainring. By eliminating the traditional spider and bolt-circle interface, this design ensures a stiffer, more secure connection between the crankarm and chainring. The result is enhanced power transfer with reduced flex under high torque loads, which is especially noticeable during steep climbs and powerful sprint efforts. Additionally, the direct-mount system allows for quicker chainring swaps, enabling riders to adapt gearing to specific trail conditions or race profiles without extensive drivetrain modifications.
Constructed from premium-grade CNC-machined 7075-T6 aluminum, the chainring delivers exceptional stiffness-to-weight ratio and high resistance to wear and impact damage. This aerospace-grade alloy is well-regarded in performance cycling components for its ability to withstand the harsh conditions of off-road riding, including repeated impacts from debris, chain strikes, and environmental exposure. The precision machining process ensures each tooth is shaped to exacting tolerances, contributing to smooth, reliable chain engagement and retention across variable terrain.
The QO ROCKS 38T also features an optimized narrow-wide tooth profile, a critical design element for modern 1X MTB drivetrains. Alternating tooth widths improve chain security by maintaining consistent engagement, significantly reducing the risk of chain drops in high-impact, technical conditions. This is particularly valuable in enduro racing, where chain retention issues can lead to costly time losses or mechanical failures on course.
Designed to seamlessly integrate with QO ROCKS cranksets, this chainring maintains an optimized chainline for modern Boost and non-Boost frame standards, ensuring efficient drivetrain operation and reduced wear on cassette and chain components. Its durability and precision make it an ideal upgrade for riders looking to enhance drivetrain performance on aggressive, technical terrain.
In addition to its functional advantages, the QO ROCKS 38T Chainring carries QO BIKE’s signature design language, with clean lines, subtle branding, and a high-quality anodized finish that not only resists corrosion but adds a refined aesthetic to any trail or enduro build.
In summary, the QO ROCKS 38T Chainring stands as a top-tier option for serious mountain bikers who prioritize performance, reliability, and technical refinement. Its combination of direct-mount stiffness, precise chain retention, and optimized gearing make it perfectly suited for the unpredictable demands of trail and enduro racing. Whether tackling steep, root-laden climbs, high-speed descents, or tight technical sections, this chainring ensures every watt of effort is efficiently transferred into forward momentum — a crucial advantage when every second on the trail counts.