# 2018 Porsche 911 Tire Size

Your Porsche was manufactured with different tire sizes. To determine the best tire size for your specific 2018 Porsche 911, we first need to determine your rim size. Please review the information below.

## How to Determine Rim Size

Check your existing tires. Your Porsche 911'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.

## 19-Inch Rims

### 2018 Porsche 911

The original tire size for your 2018 Porsche 911 is listed below. Tap on the box to view a color-coded explanation of your Porsche 911's' tire size.

Trim Options:

### CarreraCarrera 4Targa 4

## 235/40ZR19 (92 )(Front)

### Simplified Size: 235-40-19

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Porsche 911 is **235/40ZR19 (92Y) (Front)**. A color-coded explanation of the 2018 Porsche 911's tire size is shown below.

235 | This number indicates that your tire has a width of 235 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 94 millimeters. | ||||||

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. | ||||||

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

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

92 | This tire has a load index of 92, which means it's capable of carrying a load of 1386 pounds (630 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 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:

### CarreraCarrera 4Targa 4

## 295/35ZR19 (100 )(Rear)

### Simplified Size: 295-35-19

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Porsche 911 is **235/40ZR19 (92Y) (Front)**. A color-coded explanation of the 2018 Porsche 911's tire size is shown below.

295 | This number indicates that your tire has a width of 295 millimeters. | ||||||

35 | This number means that your tire has an aspect ratio of 35%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 35% of the width. In this case, the sidewall height works out to be 103 millimeters. | ||||||

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. | ||||||

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

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

100 | This tire has a load index of 100, which means it's capable of carrying a load of 1760 pounds (800 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 Y, which means 186 mph (300 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

## 20-Inch Rims

### 2018 Porsche 911

The original tire size for your 2018 Porsche 911 is listed below. Tap on the box to view a color-coded explanation of your Porsche 911's' tire size.

Trim Options:

### CarreraCarrera 4Carrera 4 GTSCarrera 4 GTS (Center Lock)Carrera 4SCarrera GTSCarrera GTS (Center Lock)Carrera SCarrera TGT3Targa 4Targa 4 GTSTarga 4 GTS (Center Lock)Targa 4STurboTurbo (Center Lock)Turbo STurbo S (Center Lock)

## 245/35ZR20 (91 )(Front)

### Simplified Size: 245-35-20

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Porsche 911 is **245/35ZR20 (91Y) (Front)**. A color-coded explanation of the 2018 Porsche 911's tire size is shown below.

245 | This number indicates that your tire has a width of 245 millimeters. | ||||||

35 | This number means that your tire has an aspect ratio of 35%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 35% of the width. In this case, the sidewall height works out to be 85 millimeters. | ||||||

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. | ||||||

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

20 | The tire size was designed to fit rims or wheels that are 20 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 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:

### CarreraCarrera 4Carrera 4 GTSCarrera 4 GTS (Center Lock)Carrera 4SCarrera GTSCarrera GTS (Center Lock)Carrera SCarrera TGT3Targa 4Targa 4 GTSTarga 4 GTS (Center Lock)Targa 4STurboTurbo (Center Lock)Turbo STurbo S (Center Lock)

## 305/30ZR20/XL (103 )(Rear)

### Simplified Size: 305-30-20

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Porsche 911 is **245/35ZR20 (91Y) (Front)**. A color-coded explanation of the 2018 Porsche 911's tire size is shown below.

305 | This number indicates that your tire has a width of 305 millimeters. | ||||||

30 | This number means that your tire has an aspect ratio of 30%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 30% of the width. In this case, the sidewall height works out to be 91 millimeters. | ||||||

Z | |||||||

R |
| ||||||

20 | The tire size was designed to fit rims or wheels that are 20 inches in diameter. | ||||||

XL | The mark of XL means extra load. A tire with this designation can handle higher inflation pressures than a regular tire, which increases its maximum load. | ||||||

103 | This tire has a load index of 103, which means it's capable of carrying a load of 1925 pounds (875 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||

## 20-21-Inch Rims

### 2018 Porsche 911

The original tire size for your 2018 Porsche 911 is listed below. Tap on the box to view a color-coded explanation of your Porsche 911's' tire size.

Trim Options:

### GT2 RSGT3 RS

## 265/35ZR20/XL (99 )(Front)

### Simplified Size: 265-35-20

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Porsche 911 is **265/35ZR20/XL (99Y) (Front)**. A color-coded explanation of the 2018 Porsche 911's tire size is shown below.

265 | This number indicates that your tire has a width of 265 millimeters. | ||||||

35 | This number means that your tire has an aspect ratio of 35%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 35% of the width. In this case, the sidewall height works out to be 92 millimeters. | ||||||

Z | |||||||

R |
| ||||||

20 | The tire size was designed to fit rims or wheels that are 20 inches in diameter. | ||||||

XL | The mark of XL means extra load. A tire with this designation can handle higher inflation pressures than a regular tire, which increases its maximum load. | ||||||

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. | ||||||

Trim Options:

### GT2 RSGT3 RS

## 325/30ZR21/XL (108 )(Rear)

### Simplified Size: 325-30-21

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Porsche 911 is **265/35ZR20/XL (99Y) (Front)**. A color-coded explanation of the 2018 Porsche 911's tire size is shown below.

325 | This number indicates that your tire has a width of 325 millimeters. | ||||||

30 | This number means that your tire has an aspect ratio of 30%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 30% of the width. In this case, the sidewall height works out to be 97 millimeters. | ||||||

Z | |||||||

R |
| ||||||

21 | The tire size was designed to fit rims or wheels that are 21 inches in diameter. | ||||||

XL | The mark of XL means extra load. A tire with this designation can handle higher inflation pressures than a regular tire, which increases its maximum load. | ||||||

108 | This tire has a load index of 108, which means it's capable of carrying a load of 2200 pounds (1000 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||