# 2018 GMC Sierra 1500 Tire Size

Your GMC was manufactured with different tire sizes. To determine the best tire size for your specific 2018 GMC Sierra 1500, we first need to determine your rim size. Please review the information below.

## How to Determine Rim Size

Check your existing tires. Your GMC Sierra 1500'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

### 2018 GMC Sierra 1500

Your 2018 GMC Sierra 1500 was manufactured with multiple tire sizes. Choose a tire size below to get a color-coded explanation of the differences. Then pick the best tire size for your 2018 GMC Sierra 1500.

## LT265/70R17/C 112

### Simplified Size: 265-70-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 GMC Sierra 1500 is **LT265/70R17/C 112Q**. A color-coded explanation of the 2018 GMC Sierra 1500's tire size is shown below.

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

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

70 | This number means that your tire has an aspect ratio of 70%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 70% of the width. In this case, the sidewall height works out to be 185 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. | ||||||

C | The mark of C denotes your tire's load range, or ply rating. A load range of C means that the tire has a ply rating of 6. Letters further along in the alphabet represent stronger tires that can sustain higher inflation pressures. Tires with higher inflation pressures can carry heavier loads. | ||||||

112 | This tire has a load index of 112, which means it's capable of carrying a load of 2464 pounds (1120 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 Q, which means 99 mph (160 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

## P255/70R17 110

### Simplified Size: 255-70-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 GMC Sierra 1500 is **P255/70R17 110S**. A color-coded explanation of the 2018 GMC Sierra 1500'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. | ||||||

70 | This number means that your tire has an aspect ratio of 70%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 70% of the width. In this case, the sidewall height works out to be 178 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. | ||||||

110 | This tire has a load index of 110, which means it's capable of carrying a load of 2332 pounds (1060 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 S, which means 111 mph (180 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

## P265/70R17 113

### Simplified Size: 265-70-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 GMC Sierra 1500 is **P265/70R17 113H**. A color-coded explanation of the 2018 GMC Sierra 1500's tire size is shown below.

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

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

70 | This number means that your tire has an aspect ratio of 70%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 70% of the width. In this case, the sidewall height works out to be 185 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. | ||||||

113 | This tire has a load index of 113, which means it's capable of carrying a load of 2530 pounds (1150 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 H, which means 130 mph (210 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

## P265/70R17 113

### Simplified Size: 265-70-17

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 GMC Sierra 1500 is **P265/70R17 113S**. A color-coded explanation of the 2018 GMC Sierra 1500's tire size is shown below.

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

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

70 | This number means that your tire has an aspect ratio of 70%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 70% of the width. In this case, the sidewall height works out to be 185 millimeters. | ||||||

R |
| ||||||

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

113 | This tire has a load index of 113, which means it's capable of carrying a load of 2530 pounds (1150 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 S, which means 111 mph (180 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

## 18-Inch Rims

### 2018 GMC Sierra 1500

There are multiple tire sizes for your 2018 GMC Sierra 1500 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 2018 GMC Sierra 1500.

Trim Options:

### SLT

## 265/65R18 114

### Simplified Size: 265-65-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 GMC Sierra 1500 is **265/65R18 114S**. A color-coded explanation of the 2018 GMC Sierra 1500's tire size is shown below.

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

65 | This number means that your tire has an aspect ratio of 65%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 65% of the width. In this case, the sidewall height works out to be 172 millimeters. | ||||||

R |
| ||||||

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

114 | This tire has a load index of 114, which means it's capable of carrying a load of 2596 pounds (1180 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 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:

### SLESLT

## P265/65R18 112

### Simplified Size: 265-65-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 GMC Sierra 1500 is **P265/65R18 112T**. A color-coded explanation of the 2018 GMC Sierra 1500's tire size is shown below.

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

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

65 | This number means that your tire has an aspect ratio of 65%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 65% of the width. In this case, the sidewall height works out to be 172 millimeters. | ||||||

R |
| ||||||

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

112 | This tire has a load index of 112, which means it's capable of carrying a load of 2464 pounds (1120 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 T, which means 118 mph (190 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |

## 20-Inch Rims

### 2018 GMC Sierra 1500

The original tire size for your 2018 GMC Sierra 1500 is listed below. Tap on the box to view a color-coded explanation of your GMC Sierra 1500's' tire size.

Trim Options:

### DenaliElevation EditionSLESLT

## P275/55R20 111

### Simplified Size: 275-55-20

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 GMC Sierra 1500 is **P275/55R20 111S**. A color-coded explanation of the 2018 GMC Sierra 1500'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. | ||||||

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 151 millimeters. | ||||||

R |
| ||||||

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

111 | This tire has a load index of 111, which means it's capable of carrying a load of 2398 pounds (1090 kg) or less. A higher number means the tire can carry more weight. A lower number means the opposite. | ||||||

## 22-Inch Rims

### 2018 GMC Sierra 1500

The original tire size for your 2018 GMC Sierra 1500 is listed below. Tap on the box to view a color-coded explanation of your GMC Sierra 1500's' tire size.

Trim Options:

### DenaliSLT

## P285/45R22 110

### Simplified Size: 285-45-22

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 GMC Sierra 1500 is **P285/45R22 110H**. A color-coded explanation of the 2018 GMC Sierra 1500's tire size is shown below.

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

285 | This number indicates that your tire has a width of 285 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 128 millimeters. | ||||||

R |
| ||||||

22 | The tire size was designed to fit rims or wheels that are 22 inches in diameter. | ||||||

110 | This tire has a load index of 110, which means it's capable of carrying a load of 2332 pounds (1060 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 H, which means 130 mph (210 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. |