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<blockquote> <strong class="quote-title">99octane wrote:</strong> <hr><br> P205/70/13 <br> The 205 is the width in millimeters, <br> The 70 is the height ("Tallness") of the tire or how much tire sidewall you see from the rim's edge to the tread, <br> the 13 is the rim diameter in inches. <br><br><br> Greg <br></blockquote>I always thought that the 205 was the height and the 70 was the width??????<br><br>
<blockquote> I always thought that the 205 was the height and the 70 was the width??????</blockquote>See - it's good to learn something new every day!<br><br>While the 70 in this case represents the height (or "tallness"), it is not the actual measurement - it is the ratio (of width to height). Quitesimply, using your numbers, the tire is 205mm wide and has a sidewall measurement of 143.5mm (205 x .7). Put into inches (25.4mm/inch), the tire is just over8 inches wide (205/25.4 = 8.071) and the sidewall measures 5.65 inches.<br><br>Nothing that Tirerack doesn't expound on but I don't think anyone's actually done the math here yet...<br><blockquote> You can put a pretty fat rim and tire combon on most cars if you get the backspacing just right.</blockquote>Not sure if Greg is actually referring to add-on spacers or, for that matter, how much spacers are even used anymore. If you stick with factorywheels, at some point (likely well beyond Bruce's 10mm difference) you may need them. I think that aftermarket wheels now typically rely on their"offset" (that is, how much of the rim is in front of the center disk and how much is behind it - think "deep-dish" for an example) toadjust for tire width.<br><br>Doug<br>
my duster came factory with 14 inch wheels, i had to use custom made 1 1/2" billet aluminum wheel adapters to fit the 275/60/15 tires out back<br><img src="http://i459.photobucket.com/albums/qq315/maddmaxx426/d1.jpg" alt="image"><br>
Frank (rdln66), I hope you read and heed, 'cause I remember your tires are ancient!<br><br>Simply put, a sidewall aspect ratio (middle number) of 70 means the sidewall is 70% the width of the tread (thus regulating height). --p<br>