# 2009 BMW Z4 Tire Size

There are multiple tire sizes for your 2009 BMW Z4 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 2009 BMW Z4.

Trim Options:

### sDrive30i

## 225/45R17 91

### Simplified Size: 225-45-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2009 BMW Z4 is **225/45R17 91V**. A color-coded explanation of the 2009 BMW Z4's tire size is shown below.

225 | This number indicates that your tire has a width of 225 millimeters. | ||||||

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 101 millimeters. | ||||||

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

17 | The tire size was designed to fit rims or wheels that are 17 inches in diameter. | ||||||

91 | This tire has a load index of 91, which means it's capable of carrying a load of 1353 pounds (615 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||

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. |

Trim Options:

### sDrive35i

## 225/45R17 91(Front)

### Simplified Size: 225-45-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2009 BMW Z4 is **225/45R17 91V (Front)**. A color-coded explanation of the 2009 BMW Z4's tire size is shown below.

225 | This number indicates that your tire has a width of 225 millimeters. | ||||||

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 101 millimeters. | ||||||

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

17 | The tire size was designed to fit rims or wheels that are 17 inches in diameter. | ||||||

91 | This tire has a load index of 91, which means it's capable of carrying a load of 1353 pounds (615 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||

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. |

Trim Options:

### sDrive35i

## 255/40R17 94(Rear)

### Simplified Size: 255-40-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2009 BMW Z4 is **225/45R17 91V (Front)**. A color-coded explanation of the 2009 BMW Z4's tire size is shown below.

255 | This number indicates that your tire has a width of 255 millimeters. | ||||||

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 102 millimeters. | ||||||

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

17 | The tire size was designed to fit rims or wheels that are 17 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. | ||||||

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. |