ROTOR 3D+ INPOWER left-hand crank arm NDS

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  • Rotor INpower 3D+ Left Only Crank Arm

    Harnessing accurate and reliable power measurement is essential for any cyclist serious about their riding. The new Rotor INpower 3D+ Left Only Crank Arm allows riders to do just that with their new axle based-power meter system. All of the electronics are housed within the Rotor axle and are thus protected from shock, temperature fluctuations and the outside elements. This allows for a more accurate and reliable collection of data.

    When developing the INpower 3D+, Rotor wanted to ensure the most reliable power reading across all cycling disciplines and the utilisation of the axle-based system has enabled them to do this. The system is powered by a single AA battery that provides over 300 hours of battery life - the equivalent of riding the three annual Grand Tours back-to-back.

    The 30 millimetre axle that houses all of the electronics is compatible with the vast majority of frames on the market and a UBB30 axle system is included. This advanced system allows you to analyse both TORQUE 360 and Optimum Chainring Angle (OCA). OCA allows you to see how much force you are putting through the pedal through the entire stroke so you can optimise your pedal stroke motion. TORQUE 360 provides a visualisation of your power through the pedal stroke so you can strive for the holy grail peanut shape power graph. Sophisticated metrics like 'Torque Effectiveness' and 'Pedal Smoothness' determine total torque versus positive torque and average power versus maximum power respectively.

    This, the left arm, is compatible with any Rotor 30 millimetre right cranks and any Rotor chainring set up including the revolutionary Q-Ring. The INpower system is ANT+ compatible and so can be used with a large range of bicycle computers.

    All of the data you collect can be tracked and analysed using the free and intuitive INpower software downloaded from the Rotor website. The sleek and stylish black colour scheme of the crankset ensures is fits seamlessly into any bike setup.

    Weight: 324 grams
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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
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    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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This item is crafted in Spain