Tire Diameter = 2 x (section width/25.4) x (aspect ratio/100) + rim diameter We will be using a P235/60R-15 tire as our example: 235 is the section width, 60 the aspect ratio, and 15 the required wheel rim diameter. Slicks, large off-road, and some larger, Pro Street style tires are already rated by diameter, so you don’t have to do any calculating for them. Please note that these formulas are for metric-rated passenger and light truck tires. The second way is to use the following formulas and figure things out yourself. The easiest way to determine tire diameter is to call your tire dealer and ask for it-easy, but not always an option. You’ll need three figures to do this: your vehicle’s current rear axle gearing, the diameter of your existing tires, and the diameter of the tires you want to use. By doing so, you can determine the axle gearing you’ll need to use with your new tire diameter in order to maintain (or enhance) performance. That’s why it’s important to compare final drive ratios with different tire heights before making any changes to tire diameter. For example, a Camaro that has decent acceleration with a set of 26-inch tall tires and 3.55 rear axle gearsbecomes a dog with 29-inch tall tires and the same gearing. Tire diameter, along with rear-axle gearing, plays a role in the final drive ratio, which in turn affects acceleration and overall performance. However, there are some serious consequences to any changes to tire diameter. We’ve also seen guys reduce the overall size of their tires for various reasons. You’re not alone-people run larger wheels and tires for aesthetic purposes. Thinking about changing the size of your tires?
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