Think hand-truck for wheels. An easy way to get your wheels to the tire guy at the track and a convenient place to store wheels while they're not in use. Heck, you can even put your tire warmers on 'em. You can make your own or buy 'em from these guys:
tyrsox.com - 2 wheels, $125
ten-80racing.com - 4 wheels, $225
powerstands.com - 4 Wheels, $250
pit-bull.com - 4 wheels, $325
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