Used race tires, eh? There's a good waste of money... how's the story go?
Ace was the local hero, winning his class every season. Billy dreamed that some day he could be as fast as Ace. So when Ace offered to sell him his old tires at half price, Billy jumped at the chance! $200 Hoosiers for olny $100!! What a deal! Even if they were a little worn they were better than $100 new tires, right?
Billy never noticed that because of his willingness to buy used tires, Ace was getting his Hoosiers at half price.
The moral of the story... buy your own tires, or you're keeping your competition in new tires at half price.