Several tire changes for NASCAR's Bristol dirt races this week

There was no question changes were needed in the Cup Series, which has seen the introduction this season of the Next Generation car which features an 18-inch bead diameter tire (they were previously 15 inches).<br>But Goodyear has gone further, changing to a radial tire this year instead of bias ply, which was used last season in the first Cup Series dirt race since 1970.<br>Bias ply tires are ...<a class='more' href='https://www.motorsport.com/nascar-cup/news/nascar-bristol-dirt-tire-change/9900982/?utm_source=RSS&utm_medium=referral&utm_campaign=R SS-NASCAR&utm_term=News&utm_content=www'>Keep reading</a>

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