Technique to Measure the Dynamic Behavior of Road Bike Wheels
In the quest to improve comfort in road cycling, a primary concern of the bike manufacturing industry is the vibration generated by the road and transmitted to the cyclist’s hands and buttocks. The bike wheels are considered to be one of the major components contributing to the bike’s vibration isolation. In this paper, we describe a technique that uses the measurement of a blocked force at the hub. A road simulator was used to impose a controlled white noise vertical displacement under the tire. Measurements were taken of the force under the tire and the blocked force at the wheel hub. Six different wheels were tested. When the force was applied at different locations on the wheel, some of the wheels showed important spatial variations of the blocked force. The results show that this technique is successful in differentiating and ranking the wheels. Each wheel was also characterized by its radial static stiffness. Preliminary results show that there is poor correlation R 2 = 0.41 between radial static stiffness and the blocked force at the dynamic hub.
The authors gratefully acknowledge financial support from the National Science and Engineering Council of Canada (NSERC) and the participation of Cervélo and Vroomen-White Design.
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