The 17-by-7.5 rim is a common rim for those vehicles that came stock with 16-inch rims, such as the S97 Ford Mustang and the Dodge Ram. If you want to upgrade your rim to a 17-by-7.5, you can choose from a couple of different tire sizes that may suit your needs.
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According to Tire Rack.com, the minimum tire width you should place on a 7.5-inch-wide rim is a tire with a width of 7 inches. The widest tire you can safely place on a rim is 9 inches. However, the manufacturer-suggested size is 7.5 inches. An example of a tire with a 7.5-inch width is P225/45R17.
A rim that is 17-by-7.5 has a wheel diameter of 17 inches. This refers to the inside diameter on the tire. When looking for the right tire, you can tell if the tire works by the alphanumeric assigned to the tire. For example, P225/47R17 denotes a popular tire size. The R17 denotes the wheel size of the tire. Any tire you pick must have R17 at the end.
Side Wall Height
The overall height of the tire on a 17-by-7.5 rim becomes an issue if the tire rubs the inner bumper well. This means the tire is too tall. Follow the vehicle manufacturer's recommendation for the tire height to prevent issues with your speedometer and inner bumper well clearance. You can get the height of a tire by a mathematical equation. Using P225/47R17 as a reference: Multiply 17 by 25.4 to get the wheel size in millimetres. This comes out to 431.8mm. Divide 224 by .47 to get the sidewall width in millimetres. This comes out to 478.2. Add 431.8 to 431.8 to get the overall tire height in millimetres and then divide it by 25.4 to convert it to inches. This comes out to 35.82 inches. In this example, the tire you place on your 17-by-7.5 rim must be 35.82 inches in height.
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