2018 Subaru WRX STI Tire Size

The original tire size for your 2018 Subaru WRX STI is listed below. Tap on the box to view a color-coded explanation of the best Subaru WRX tire size.

245/35R19 89W

Simplified Size:  245-35-19

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Subaru WRX STI is 245/35R19 89W.  A color-coded explanation of the 2018 Subaru WRX STI'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.

R

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

RRadial
BBias Belt
DDiagonal
19

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

89

This tire has a load index of 89, which means it's capable of carrying a load of 1276 pounds (580 kg) or less.  A higher number means the tire can carry more weight.  A lower number means the opposite.

W

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.

2018 Subaru WRX STI - Similar Models

The 2018 Subaru WRX STI has similar models that may have different tire sizes.

2018 Subaru WRX