ROTOR REX 1.1 crankset 76mm

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  • REX 1.1

    ROTOR believes that functionality and realiability - not fashion - best define material selection when it comes to crafting 1x and 2x REX 1 cranks. Crank arms CNC - machined from aeronautic-grade 7055 aluminiun are combined with proprietary technologies to yield cranks with and exceptional stiffness-to-weight ratio that can handle a thrashing off road. Together with ROTOR´s Universal Bottom Bracket (UBB) system, ROTOR cranks offer a performance upgrade opportunity for almost all mountain bikes on the market.

    Short description

    • Weight: 172.5mm length 506g
    • Sizes: 170/172,5/175mm


    Characteristics

    • Spindle: 30mm
    • Q-Factor: 163 mm
    • Chainline: REX 1.1 50.6mm / REX 1.1 Cannondale 56mm / REX 1.2 44.5mm
    • Material: aluminum alloy 7055 100% CNC-machined
    • Compatibility: Bottom Bracket BSA , BB89 , BB92 , PF30 , BBRight , Cannondale F-Si Ai (spider sold separately) , Oval and round chainrings , 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