ROTOR BB 4224 bottom bracket BB30

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  • BB 4224 (BB30 to 24)

    Your brand loyalty is admirable; your acute knowledge of so-called standards gets tested every time you add a new bike to the stable. In a perfect world, you'd be able to easily swap out parts based on what kind of riding you feel like doing that day. But guess what? In a less-than-perfect world, for you ROTOR designed the BB 4224 for your BB30 shell to accommodate your cranks with a 24mm axle. The BB 4224 is the "yes" component to "Is this compatible with my BB30 bottom bracket for a 24mm axle?"

    Versions:

    • PF4224 68mm road steel black 119g
    • PF4224 68mm road ceramic red 113g
    • PF4224 73mm mtb steel black 124g
    • PF4224 73mm mtb ceramic red 118g


    Characteristics:

    • Designed to work with BB30 bottom brackets
    • 100% CNC-machined, 7075 aluminum
    • Labyrinth seals prevent bearing contamination
    • Designed to work with ROTOR and Shimano 24mm cranksets


    BB4224 - BB30-24 ROAD
    BB4224 - BB30-24 MTB

    BB30

    ROTOR - BB & Spacers
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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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