not sure what its called, maybe just a tire tray, its great cuz it can fit upto a 3.0 tire. When we used to load up on my friends older sportworks i had to deflate my tires (2.4) but now i don't have to worry about it.
Those wheel holders are cool. I have the hoops on mine and they are a pain at times with my 2.5 tires. Nonetheless, this is the most awesome rack. Mine has been on through all winter but I do see some rust at a couple of paint chipped areas.
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