2003 Infiniti M45 Tire Size

Your 2003 Infiniti M45 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 2003 Infiniti M45.

235/45R18 94W

Simplified Size:  235-45-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2003 Infiniti M45 is 235/45R18 94W.  A color-coded explanation of the 2003 Infiniti M45's tire size is shown below.

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.

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.

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 105 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
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.

P235/45R18 94V

Simplified Size:  235-45-18

Simplified size is useful for shopping and buying tires.

The original tire size for your 2003 Infiniti M45 is P235/45R18 94V.  A color-coded explanation of the 2003 Infiniti M45's tire size is shown below.

P

This letter denotes the intended use of the tire.

PPassenger Vehicle
LTLight Truck
CCommercial Vehicle
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.

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.

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 105 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
V

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.