ROTOR Press Fit 4124 bottom bracket road BB86 MTB BB89/BB92

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  • PRESS FIT 4124

    You had your choice of any bike in the shop but you made your selection based on potential upgrade options. The Press Fit 4124 will easily accommodate your handpicked rig with its press fit, 41mm diameter with 24mm axle BB shell. ROTOR conceived its Universal Bottom Bracket (UBB) concept to eliminate the complicated bottom bracket/crank compatibility challenge that has increasingly frustrated the mechanics at your LBS. The Press Fit 4124 is the "yes" component to "Is this compatible with my press fit 41mm diameter BB shell for a 24mm axle"

    Short description

    Versions:

    • PF4124 hybrid ceramic black 55g
    • PF4124 steel black 60g


    Characteristics:

    • Designed to work with BB86, BB89 and BB92 bottom brackets 100% CNC-machined, 7075 aluminum
    • Labyrinth seals prevent bearing contamination
    • Designed to work with ROTOR and Shimano 24mm cranksets


    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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This item is crafted in Spain