Why don't motorcycles have tire deflectors?
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We all know that a properly designed and placed tire deflector(spat) can reduce drag on cars, why don't motorcycles use them too? (on rear wheels) I have been looking at aero focused production motorcycles like the BMW K1000 and the Suzuki Hayabusa and have not noticed any sort of tire deflectors. It seems like an easy drag reduction mod to me, is there something i'm missing?
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By spats you mean enclosing the rear wheel as on a Vincent Black Prince?
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Do bikes need a spat with their domed tires? Car tires present a flat surface with a lot of tread to the leading air, but bike tires are round with little tread...could the benefit of a spat be so little that it's not worth adding to the vehicle?
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The ground clearance on a motorcycle is roughly half that of a car. The wheelbase is much shorter also. So the cost effectiveness may not be much. Do the A-B-A test and find out. What gets measured gets improved.
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From a purely aero perspective, the wheels are probably the least dirty part of a bike.
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Have you ever rode a bike with solid wheels? Side winds blow you all over the road. Enclosed tires on a motorcycle is only a good idea if the body is streamlined.
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Fuel efficiency is far far down the list of importance for the industry.
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