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Borrowing its desing from REX1, the forced and CNC´d REX 2 cranks are enhanced by proprietary TDS triple drilling technology to yield the perfect weight-to-stiffness ratio. The REX 2 used ROTOR´s UBB 30 technology, offering a performance upgrade opportunity for almost all mountain bikes on the market - whether they were designed for 30mm cranks or not.
Weight: REX 2.1 (172.5mm length 514 g) / REX 2.2 - (521g)
Sizes: 170/172,5/175mm Characteristics
Spindle: 30mm aluminum alloy
Q-Factor: 163 mm
Chainline: REX 2.1 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
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.
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