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Old 02-25-2017, 03:22 AM   #11 (permalink)
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Tire deflectors make sense on wider tires.
Motorcycle tires are round, thus 'cut' better through the wind. Makes no sense to equip them with it, because they will only add drag.

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Old 02-25-2017, 01:41 PM   #12 (permalink)
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I don't think that it would add drag so much as get in the way.

My bike has 6.5" of clearance, and 5.5" of suspension. The inch that's left over is pretty minimal and can be taken up with tire deformation on a big hit. I don't things hanging underneath to get torn off.

The short wheel base and round tires, combined with minimal clearance all contribute to making rear wheel spats unnecessary.
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Old 02-27-2017, 01:08 AM   #13 (permalink)
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I've thought that spats on cars didn't necessarily help by deflecting air away from the tires, but directing air away from the wheel wells.
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Old 03-05-2017, 08:34 AM   #14 (permalink)
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Bigger improvements can be had at the front wheel where relative wheel speed is higher; LSR fenders have shown 2-3 mph top speed improvement on big bikes. This may not sound like much, but given the high speeds it is significant.

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