1991 Porsche 911 Tire Size
Your Porsche was manufactured with different tire sizes. To determine the best tire size for your specific 1991 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 16inch rims.
Rim Size Selection
Now that you know your rim size, make a selection below to filter your results.
16Inch Rims
1991 Porsche 911
The original tire size for your 1991 Porsche 911 is listed below. Tap on the box to view a colorcoded explanation of your Porsche 911's' tire size.
Trim Options:
Carrera 2Carrera 4
225/50ZR16(Rear)
Simplified Size: 2055516
Simplified size is useful for shopping and buying tires.
The original tire size for your 1991 Porsche 911 is 205/55ZR16 (Front). A colorcoded explanation of the 1991 Porsche 911's tire size is shown below.
225  This number indicates that your tire has a width of 225 millimeters.  
16  The tire size was designed to fit rims or wheels that are 16 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.  
50  This number means that your tire has an aspect ratio of 50%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 50% of the width. In this case, the sidewall height works out to be 112 millimeters.  
R  This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.

Trim Options:
Carrera 2Carrera 4
205/55ZR16(Front)
Simplified Size: 2255016
Simplified size is useful for shopping and buying tires.
The original tire size for your 1991 Porsche 911 is 205/55ZR16 (Front). A colorcoded explanation of the 1991 Porsche 911's tire size is shown below.
205  This number indicates that your tire has a width of 205 millimeters.  
16  The tire size was designed to fit rims or wheels that are 16 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.  
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 112 millimeters.  
R  This letter denotes how your tire was constructed. Radial is the standard construction method for about 99% of all tires sold today.

17Inch Rims
1991 Porsche 911
The original tire size for your 1991 Porsche 911 is listed below. Tap on the box to view a colorcoded explanation of your Porsche 911's' tire size.
Trim Options:
Carrera 2Carrera 4Turbo
255/40ZR17(Rear)
Simplified Size: 2055017
Simplified size is useful for shopping and buying tires.
The original tire size for your 1991 Porsche 911 is 205/50ZR17 (Front). A colorcoded explanation of the 1991 Porsche 911's tire size is shown below.
255  This number indicates that your tire has a width of 255 millimeters.  
17  The tire size was designed to fit rims or wheels that are 17 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.

Trim Options:
Carrera 2Carrera 4Turbo
205/50ZR17(Front)
Simplified Size: 2554017
Simplified size is useful for shopping and buying tires.
The original tire size for your 1991 Porsche 911 is 205/50ZR17 (Front). A colorcoded explanation of the 1991 Porsche 911's tire size is shown below.
205  This number indicates that your tire has a width of 205 millimeters.  
17  The tire size was designed to fit rims or wheels that are 17 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.  
50  This number means that your tire has an aspect ratio of 50%. In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 50% 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.
