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Introducing the new ALDHU cranks, ROTOR’s lightest cranks ever. The innovative modular structure, together with axles and different chainring options, makes each component individually available to accommodate the current spectrum of riders and bike standards. The ALDHU incorporates OCP Mount technology, which enables the rider to fine-tune the orientation of ROTOR’s oval Q rings. The ALDHU’s proprietary, patent-pending design is based on the modularity of each crankset component. Our new model name comes directly from our racing heritage. It is an abbreviation of Alpe d’Huez to commemorate ROTOR’s first iconic victory at the Tour de France with Carlos Sastre.
Spider: DIRECT MOUNT, or SPIDER MOUNT BCD 110x4 rings 110mm BCD x 4 ALDHU 3D+ / Vegast Spider
Weight: 355g (170mm cranks)
Q-Factor: 147mm standard axle, Axle is available separately
ChainLine: 43.5 mm
Material: 7055 aluminium
Technologies: OCP Mount, Direct Mount, Trinity Drilling System, Twin Leg Concept, Alu 7055, CNC
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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