ROTOR REX 3.1 crankset 76mm

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  • REX 3.1

    Thinking about becoming single? It´s great for weight loss, easier maintenance, and for looking faster. We´ll help you make a clean break with your current cranks by swappng them out for REX 3.1. We wanted to craft a 1x crank for mtb frames with 24mm axles that could be matched with our QX rings (or noQX rings – your choice) for optimum pedaling efficiency with a single chainring setup. Crank arms CNC-machined from 7075 aluminum are combined with proprietary technologies to yield cranks with an exceptional stiffness-to-weight ratio that can handle an off-road thrashing. Together with ROTOR's Universal Bottom Bracket (UBB) system, the REX 3.1 offers a performance upgrade opportunity for all single ring mountain bikes with 24mm frame axles.

    Short description

    • Weight: 172.5mm length 532g
    • Sizes: 170/172.5/175mm


    Characteristics

    • Spider: 76BCD
    • Spindle: 24mm steel
    • Q-Factor: 163 mm
    • Chainline: 51mm
    • Material: 100% CNC-machined, 7075 aluminum alloy
    • Compatibility: Bottom bracket BSA, BB89, BB92, BB95, BB30, PF30, BBRight Oval and round chainrings, 76BCD, 9,10 and 11 speed


    User Manual
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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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This item is crafted in Spain