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On Sat, 2006-02-04 at 18:27, Constantino Tobio wrote: > Short lesson here on decoding tire sidewall ratings: > > P165/80R15 86T > P=Passenger Car tire > 165=width in mm sidewall to sidewall at the widest point > 80=Aspect ratio. Ratio of sidewall height to width. This tire is 80% of > 165, 132mm > R=Tire construction type. R for Radial. Bias ply tires are D, > 15=Diameter of rim in inches. > > 86=Load index, a code corresponding to the weight that tire can carry by > itself > T=T speed rating, 118 mph. Sometimes this code is also found before the > tire contruction type (i.e. TR, SR, ZR) > Back in the days before all 50, 60, 80 series tire ratings came into being, tire sizes were marked with like I said originally. 165SR15 would have been a steel belted radial. This is when bias plys were the tire. And most people didn't even know what a radial was. My first radials were Michelin X 155 SR 15's on a bug back in 1964. Not the XZX's that are sold today. -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) '05 KIA Sorento SUV russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~