ROTOR Q-Ring MTB QX2 SRAM

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  • If your bike reflects your identity as a mountain biker, then selectivity and brand loyalty marks your choices. For SRAM cranks requiring a specific BCD, we crafted special 120/80BCD QX2 rings for your SRAM 2x cranks. In addition to biomechanical performance, we wanted everyone to experience Q-Rings – QX2 rings with 120/80BCD provide all the performance benefits of standard QX2´s while accommodating proprietary spider designs.

    The QX2´s feature a subtle 10% ovality and offer 3 Optimum Chainring Positions (OCP), which can be dialed in to take advantage of the most-powerful part of your pedal stroke to give you faster acceleration and better traction when you need it most.

    Weight:
    110g per set 40/27, 95g per set 38/26

    Sizes:
    Outer - 40, 38t
    Inner - 27, 26t

    Characteristics:
    • 100% CNC-machined, 7075-T6 aluminum alloy
    • Aero design and reinforced rigidity
    • Steel shifting pins
    • 3 OCP points (2-3-4)
    • Designed to work with all 9, 10 and 11 speed groupsets
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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.
  • Attachements
    Front derailleur adjustmentsinstruction manual
    517.09 KB
    Which bottom bracket do I need?instruction manual
    894.62 KB
    Which bottom bracket do I need?instruction manual
    894.62 KB
    Q-Ring adaption guide / Starting with Q-Ringsinstruction manual
    194.47 KB
    Q-Ring adaption guide / Starting with Q-Ringsinstruction manual
    108.76 KB
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