![]() A steady state analysis assumes the wheels, bike and rider are in a nice environment where air is hitting them at a perfect speed and perfect angle. The testing that has been carried out is usually steady state. A comparative analogy would be fuel consumption for a car driving along a perfectly smooth glass like road surface with no wind and no change in speed – it is totally unrealistic. Journalists on the other hand tend to visit their local university and ask some clever boffin to conduct their testing for them and give them the results or go to their local velodrome, hold a speed and see how much power the wheels consume.īoth of the above testing methodologies are not representative of the real world. The reality is this type of test is not impartial. This is usually achieved by a combination of adjusting speeds and angles. Wheel manufacturers will usually adjust tests to make their particular wheels look more favourable than their competitors in testing. In the bike industry, wheel aerodynamic testing has generally been conducted by two groups of people – Wheel manufacturers and journalists. The effective air speed at the top of a wheel/tyre is double the indicated speed of the bike. The first is they hit the air first as they are the most forward part of the bike and second because they are rotating. ![]() ![]() The drag caused by wheels is significant because of two fundamental reasons. In terms of drag caused by a bicycle rider, the biggest loss is caused by the rider themselves followed by the wheels and frame. The effect of Tyre width on Aerodynamic performance.
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