ROTOR Directmount 1-speed chainring round for 2INpower DM/INpower DM/Aldhu/Vegast noir

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  • Round 1x (One By) DM Chainrings

    Our new one-piece Round Direct Mount chainrings are machine CNC’d from single blocks of ultralight aeronautic-grade 7075 aluminum and can be mounted straight onto the axle or crank arm. With fewer individual parts we’ve shaved precious grams off the component weight and focused on delivering you ease of assembly and maintenance. The integrated configuration means a simplified lightweight solution without compromising on durability.

    The clever spline interface between the Direct Mount and the axle delivers a robust yet smooth engagement allowing you to maximise the efficiency in transmission of power in your pedal rotation. This advanced solution is achieved thanks to the patented anchoring system of our Optimal Changing Position (OCP) Mount technology. The unique design of the teeth incorporates all the experience gained in the technological development of oval Q Rings and provides a consistently fast and precise gear shift in the most challenging of cycling conditions.

    Weight: 92g for 40t, 127g for 50t
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  • Why Q-rings?
    Biomechanical studies indicate that the effort made with Q-Rings becomes a greater performance and pedaling feeling more rounded and smooth due to their ability to make a better use of the strongest muscle groups while they also compensate the dead spot in pedaling.
    Q-Ring-Round Ring Comparison
    Far from feeling unusual, a Q-Ring feels much rounder than a round ring. A spinscan analysis visualize a cyclists power delivery, with a bar graph indicating the variation from maximum to minimum output and a polar graph showing the rotating shape of the power profile.

    By comparing the left hand Round chainring spinscan and the right hand Q-Ring spinscan below, one can see that Q-Ring graphs are clearly smoother (less variation in torque in the bar graph) and fuller (less of a peanut shape at the weakest point).
    Spinscan
    When one projects a polar plot of a typical spinscan over the varying drivetrain resistance of a 53t Q-Ring during its rotation, the value of a Q-Ring is clearly visible: Maximum power is met with a “56,5t” Time trial sized chainring diameter and minimum power is met with a “50,4” compact size chainring diameter.
    This variation creates the “perfect spin” we all aspire to, that simply isn’t possible with round chainrings. This is because Q-Rings compensate for the weakest zone of the pedalling stroke and maximize use of the most powerful zone.
    Key benefits (based on ROTOR study)
    • All Q-ring TT’s were faster, with an average gain of 1.6 sec and 0.7 km/h (1.8%).
    • All Q-Ring TT’s generated more power, with average increase of 26.7 W (6.2%)
    • Reduced oxygen consumption and heart rate in submaximal tests
    • An immediate performance increase on switching from round rings to Q-Rings
    • An immediate performance reduction on switching back to round chainrings
    • It also appears that the more effort a cyclist exerts, the greater the benefit of Q’s

    Please see this article for more detailed information.
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Ce produit est manufacturé à la main en Espagne