ROTOR Flow INPOWER left-hand crank arm NDS

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  • Flow INPOWER left-hand crank arm

    If you already have a Rotor Flow crank, with or without the MAS spider, you can add power to your life by picking up this INpower Flow left crank arm. As the power meter is embedded in the 30mm thru-axle, which is attached to the left crank, all you need to do is pull your existing left arm and spindle, and install this.

    INpower refers to the system Rotor utilizes for measuring power. They’ve put the strain gauges and the hardware inside their Universal Bottom Bracket (UBB) thru-axle. Inside the bb=INpower. A 30mm hollow aluminum axle isn’t only strong and light: it’s got room for electronics. There are two strain gauges embedded inside the spindle. They’re powered by a single AA battery, which lasts for up to 300 hours of riding. The signal is sent via the ANT+ protocol from a transmitter on top of the left crankarm to any ANT+ enabled head unit. Stashing the electronics inside the axle does several good things. It is protected from the elements. It is protected from crashes. It puts the added weight, which is 30g here, inside the smallest possible circle: the added mass is rotating in the smallest circle possible. It is about as waterproof as a powermeter can get. And it makes the unit less temperature-sensitive: in fact, along with the programming, temperature should not affect INpower at all.
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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).
    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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This item is crafted in Spain