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Message: <blockquote data-quote="Mike Honcho" data-source="post: 1457213" data-attributes="member: 23861"><p>I bought my car without a spare and ended up stranded with a cracked wheel/flat tire so I need to get a spare asap. I don't know much about comparing tire sizes, I'm trying find a size that will work for both front and year. I have 18x9 wheels all the way around with 245/40/18 in front and 285/35/18 in the rear. I used a tire size calculator to overlay both tire sizes and they look nearly identical in height. So I was planning to use a non-directional 245/40/18, that way position doesn't matter when changing a flat. My only concern is using a different size in the rear, I know you want both tires to be the same height on a solid axle. According to the calculator, sidewall height difference is only 0.07mm difference. Is that enough to cause any issues? I wouldn't think so, but I wanted to double check if someone has more knowledge on the subject.</p></blockquote><p></p>