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Tire aspect ratio calculator
Tire aspect ratio calculator








tire aspect ratio calculator

A tire mounted on a narrow rim would be "narrower" than if the same size tire was mounted on a wide rim. The width of the rim will influence the width of the tire. A tire's rim width range identifies the narrowest to the widest rim widths that the tire is designed to fit. The measuring rim width is sometimes referred to as the tire's "design rim width".īecause tires have flexible sidewalls, a single tire size will fit on a variety of rim widths. This standardized measuring rim width allows all of the tires produced around the world to meet the same dimensional standards and therefore, be equivalent with regards to their physical size. Because the width of the rim will influence the width of the tire, a standard rim width for every tire size is assigned and must be used.

tire aspect ratio calculator

The measuring rim width is the industry standardized rim width upon which the tire must be mounted in order to confirm it meets its dimensional targets. are (if they exist):Īnyway, once you know it, the tire diameter is easily available from tire catalogs, if you don't feel like doing the calculations. New Tire Dia = Original Tire Dia * (Gear Ratio / Effective Gear Ratio) If you want to know which tire dia you need to "simulate" a 3.42 from your 3.73 compare to original tire dia: Which means that if you had the original tires, you would need to change the gear ratio to 3.64 if you wanted to get the same performance as you have right now. Like Tom said, the original tire diameter on a Chevelle was around 26.4". Tire Dia = 15 + (60 * 255) / 1270 = 27.05"Įffective Gear Ratio = Gear Ratio * (Original Tire Dia / New Tire Dia) Tire Dia = Wheel Dia + (Aspect Ratio * Tire Width) / 1270įor example, if you have a 255/60R15 tire, then: To calculate your tire diameter in inches you have to use the following equation:










Tire aspect ratio calculator