
2006 Pontiac Grand Prix Tire Size
Your Pontiac was manufactured with different tire sizes. To determine the best tire size for your specific 2006 Pontiac Grand Prix, we first need to determine your rim size. Please review the information below.
How to Determine Rim Size
Check your existing tires. Your Pontiac Grand Prix's rim size is the number to the right of the R. In the example pictured here, the tire size fits 16-inch rims.

Rim Size Selection
Now that you know your rim size, make a selection below to filter your results.
16-Inch Rims
2006 Pontiac Grand Prix
The original tire size for your 2006 Pontiac Grand Prix is listed below. Tap on the box to view a color-coded explanation of your Pontiac Grand Prix's' tire size.
P225/60R16 97
Simplified Size: 225-60-16
Simplified size is useful for shopping and buying tires.
The original tire size for your 2006 Pontiac Grand Prix is P225/60R16 97S. A color-coded explanation of the 2006 Pontiac Grand Prix's tire size is shown below.
P | This letter denotes the intended use of the tire.
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225 | This number indicates that your tire has a width of 225 millimeters. | ||||||
16 | The tire size was designed to fit rims or wheels that are 16 inches in diameter. | ||||||
97 | This tire has a load index of 97, which means it's capable of carrying a load of 1606 pounds (730 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||
60 | This number means that your tire has an aspect ratio of 60%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 60% of the width. In this case, the sidewall height works out to be 135 millimeters. | ||||||
R | This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.
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This tire has a speed rating of S, which means 111 mph (180 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |
17-Inch Rims
2006 Pontiac Grand Prix
The original tire size for your 2006 Pontiac Grand Prix is listed below. Tap on the box to view a color-coded explanation of your Pontiac Grand Prix's' tire size.
Trim Options:
GT
P225/55R17 95
Simplified Size: 225-55-17
Simplified size is useful for shopping and buying tires.
The original tire size for your 2006 Pontiac Grand Prix is P225/55R17 95H. A color-coded explanation of the 2006 Pontiac Grand Prix's tire size is shown below.
P | This letter denotes the intended use of the tire.
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225 | This number indicates that your tire has a width of 225 millimeters. | ||||||
17 | The tire size was designed to fit rims or wheels that are 17 inches in diameter. | ||||||
95 | This tire has a load index of 95, which means it's capable of carrying a load of 1518 pounds (690 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||
55 | This number means that your tire has an aspect ratio of 55%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 55% of the width. In this case, the sidewall height works out to be 123 millimeters. | ||||||
R | This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.
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This tire has a speed rating of H, which means 130 mph (210 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |
18-Inch Rims
2006 Pontiac Grand Prix
The original tire size for your 2006 Pontiac Grand Prix is listed below. Tap on the box to view a color-coded explanation of your Pontiac Grand Prix's' tire size.
Trim Options:
GXP
P225/50R18 94(Rear)
Simplified Size: 255-45-18
Simplified size is useful for shopping and buying tires.
The original tire size for your 2006 Pontiac Grand Prix is P255/45R18 99W (Front). A color-coded explanation of the 2006 Pontiac Grand Prix's tire size is shown below.
P | This letter denotes the intended use of the tire.
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225 | This number indicates that your tire has a width of 225 millimeters. | ||||||
18 | The tire size was designed to fit rims or wheels that are 18 inches in diameter. | ||||||
94 | This tire has a load index of 94, which means it's capable of carrying a load of 1474 pounds (670 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||
50 | This number means that your tire has an aspect ratio of 50%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 50% of the width. In this case, the sidewall height works out to be 112 millimeters. | ||||||
R | This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.
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This tire has a speed rating of W, which means 167 mph (270 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |
Trim Options:
GXP
P255/45R18 99(Front)
Simplified Size: 225-50-18
Simplified size is useful for shopping and buying tires.
The original tire size for your 2006 Pontiac Grand Prix is P255/45R18 99W (Front). A color-coded explanation of the 2006 Pontiac Grand Prix's tire size is shown below.
P | This letter denotes the intended use of the tire.
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255 | This number indicates that your tire has a width of 255 millimeters. | ||||||
18 | The tire size was designed to fit rims or wheels that are 18 inches in diameter. | ||||||
99 | This tire has a load index of 99, which means it's capable of carrying a load of 1705 pounds (775 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||
45 | This number means that your tire has an aspect ratio of 45%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 45% of the width. In this case, the sidewall height works out to be 114 millimeters. | ||||||
R | This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.
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This tire has a speed rating of W, which means 167 mph (270 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |