Stitches040 Posted June 19, 2011 Report Share Posted June 19, 2011 (edited) This is just a 'Quick Reference' to help out everyone when they go to buy some new Tires. Tire Size Calculator - ... Link (Miata) Tire Size Calculator II ... http://www.discounttiredirect.com/direct/brochure/info/tmpInfoTireMath.jsp Tire Size - Information Sidewall Aspect Ratio Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio. P225/50R16 91S The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall. Uniform Tire Quality Grading (UTQG) Treadwear Rating Tempurature Rating Traction Rating Speed Ratings Load Ratings Tire Build Date If I have forgotten anything, please remind me, and I will post it up ... Edited February 10, 2013 by Stitches040 (see edit history) Quote Link to comment Share on other sites More sharing options...
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