# 2008 Cadillac STS Tire Size

Your Cadillac was manufactured with different tire sizes. To determine the best tire size for your specific 2008 Cadillac STS, we first need to determine your rim size. Please review the information below.

## How to Determine Rim Size

Check your existing tires. Your Cadillac STS'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.

## 17-Inch Rims

### 2008 Cadillac STS

There are multiple tire sizes for your 2008 Cadillac STS that depend upon the trim level. Look for your trim level below to get a color-coded explanation of your tire size. Then pick the best tire size for your 2008 Cadillac STS.

Trim Options:

### V6 (AWD)V6 w/Luxury Pkg. (AWD)V8 w/Luxury Performance Pkg. (RWD)V8 w/Luxury Pkg. (RWD)

## P235/50R17 95

### Simplified Size: 235-50-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **P235/50R17 95S**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

P | This letter denotes the intended use of the tire.
| ||||||

235 | This number indicates that your tire has a width of 235 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. | ||||||

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 117 millimeters. | ||||||

R | This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.
| ||||||

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. |

Trim Options:

### V6 (RWD)V6 w/Luxury Pkg. (RWD)

## P235/50R17 95

### Simplified Size: 235-50-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **P235/50R17 95V**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

P | This letter denotes the intended use of the tire.
| ||||||

235 | This number indicates that your tire has a width of 235 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. | ||||||

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 117 millimeters. | ||||||

R | This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.
| ||||||

This tire has a speed rating of V, which means 149 mph (240 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

## 18-Inch Rims

### 2008 Cadillac STS

There are multiple tire sizes for your 2008 Cadillac STS that depend upon the trim level. Look for your trim level below to get a color-coded explanation of your tire size. Then pick the best tire size for your 2008 Cadillac STS.

Trim Options:

### V6 w/Luxury Performance Pkg. (RWD)(Summer Only)V8 w/Premium Luxury Performance Pkg. (Summer Only)

## 255/45ZR18 99

### Simplified Size: 255-45-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **255/45ZR18 99Y**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

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. | ||||||

Z | This tire has a speed class of Z, which means it's part of an elite speed class of 149 mph or more (240 km/h). A tire's speed class is less specific than the speed rating. | ||||||

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.
| ||||||

This tire has a speed rating of Y, which means 186 mph (300 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

Trim Options:

### Platinum

## P255/45R18 99(Rear)

### Simplified Size: 235-50-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **P235/50R18 97W (Front)**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

P | This letter denotes the intended use of the tire.
| ||||||

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 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:

### Platinum

## P235/50R18 97(Front)

### Simplified Size: 255-45-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **P235/50R18 97W (Front)**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

P | This letter denotes the intended use of the tire.
| ||||||

235 | This number indicates that your tire has a width of 235 millimeters. | ||||||

18 | The tire size was designed to fit rims or wheels that are 18 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. | ||||||

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 117 millimeters. | ||||||

R |
| ||||||

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:

### V6 w/Luxury Performance Pkg. (RWD)V8 w/Luxury Performance Pkg. (RWD)V8 w/Premium Luxury Performance Pkg.

## P255/45ZR18 99(Rear)

### Simplified Size: 235-50-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **P235/50ZR18 97W (Front)**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

P | This letter denotes the intended use of the tire.
| ||||||

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. | ||||||

Z | This tire has a speed class of Z, which means it's part of an elite speed class of 149 mph or more (240 km/h). A tire's speed class is less specific than the speed rating. | ||||||

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 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:

### V6 w/Luxury Performance Pkg. (RWD)V8 w/Luxury Performance Pkg. (RWD)V8 w/Premium Luxury Performance Pkg.

## P235/50ZR18 97(Front)

### Simplified Size: 255-45-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **P235/50ZR18 97W (Front)**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

P | This letter denotes the intended use of the tire.
| ||||||

235 | This number indicates that your tire has a width of 235 millimeters. | ||||||

18 | The tire size was designed to fit rims or wheels that are 18 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. | ||||||

Z | This tire has a speed class of Z, which means it's part of an elite speed class of 149 mph or more (240 km/h). A tire's speed class is less specific than the speed rating. | ||||||

50 | |||||||

R |
| ||||||

## 18-19-Inch Rims

### 2008 Cadillac STS

The original tire size for your 2008 Cadillac STS is listed below. Tap on the box to view a color-coded explanation of your Cadillac STS's' tire size.

Trim Options:

### V

## P275/40R19 101(Rear)

### Simplified Size: 255-45-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **P255/45R18 99Y (Front)**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

P | This letter denotes the intended use of the tire.
| ||||||

275 | This number indicates that your tire has a width of 275 millimeters. | ||||||

19 | The tire size was designed to fit rims or wheels that are 19 inches in diameter. | ||||||

101 | This tire has a load index of 101, which means it's capable of carrying a load of 1815 pounds (825 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||

40 | This number means that your tire has an aspect ratio of 40%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 40% of the width. In this case, the sidewall height works out to be 110 millimeters. | ||||||

R |
| ||||||

This tire has a speed rating of Y, which means 186 mph (300 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

Trim Options:

### V

## P255/45R18 99(Front)

### Simplified Size: 275-40-19

Simplified size is useful for shopping and buying tires.

The original tire size for your 2008 Cadillac STS is **P255/45R18 99Y (Front)**. A color-coded explanation of the 2008 Cadillac STS's tire size is shown below.

P | This letter denotes the intended use of the tire.
| ||||||

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 | |||||||

45 | |||||||

R |
| ||||||

This tire has a speed rating of Y, which means 186 mph (300 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |