2003 BMW M3 Tire Size
Your BMW was manufactured with different tire sizes. To determine the best tire size for your specific 2003 BMW M3, we first need to determine your rim size. Please review the information below.
How to Determine Rim Size
Check your existing tires. Your BMW M3's rim size is the number to the right of the R. In the example pictured here, the tire size fits 16inch rims.
Rim Size Selection
Now that you know your rim size, make a selection below to filter your results.
18Inch Rims
2003 BMW M3
The original tire size for your 2003 BMW M3 is listed below. Tap on the box to view a colorcoded explanation of your BMW M3's' tire size.
255/40ZR18(Rear)
Simplified Size: 2254518
Simplified size is useful for shopping and buying tires.
The original tire size for your 2003 BMW M3 is 225/45ZR18 (Front). A colorcoded explanation of the 2003 BMW M3's tire size is shown below.
255  This number indicates that your tire has a width of 255 millimeters.  
18  The tire size was designed to fit rims or wheels that are 18 inches in diameter.  
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.  
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.

225/45ZR18(Front)
Simplified Size: 2554018
Simplified size is useful for shopping and buying tires.
The original tire size for your 2003 BMW M3 is 225/45ZR18 (Front). A colorcoded explanation of the 2003 BMW M3's tire size is shown below.
225  This number indicates that your tire has a width of 225 millimeters.  
18  The tire size was designed to fit rims or wheels that are 18 inches in diameter.  
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.  
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.

19Inch Rims
2003 BMW M3
The original tire size for your 2003 BMW M3 is listed below. Tap on the box to view a colorcoded explanation of your BMW M3's' tire size.
255/35ZR19(Rear)
Simplified Size: 2254019
Simplified size is useful for shopping and buying tires.
The original tire size for your 2003 BMW M3 is 225/40ZR19 (Front). A colorcoded explanation of the 2003 BMW M3's tire size is shown below.
255  This number indicates that your tire has a width of 255 millimeters.  
19  The tire size was designed to fit rims or wheels that are 19 inches in diameter.  
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.  
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 89 millimeters.  
R  This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.

225/40ZR19(Front)
Simplified Size: 2553519
Simplified size is useful for shopping and buying tires.
The original tire size for your 2003 BMW M3 is 225/40ZR19 (Front). A colorcoded explanation of the 2003 BMW M3's tire size is shown below.
225  This number indicates that your tire has a width of 225 millimeters.  
19  The tire size was designed to fit rims or wheels that are 19 inches in diameter.  
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.  
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 90 millimeters.  
R  This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.
