2005 MercedesBenz C230 Tire Size
Choose the correct tire size for your 2005 MercedesBenz C230 to get a detailed explanation of the tire code. If you don't know the correct stock tire size, check the inside of your driver side door or owner's manual.
Front Tire 225/45R17 91 


225 
This number indicates that your tire has a width of 225 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 101.25 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. 

91 
This tire has a load index of 91, which means it's capable of carrying a load of 1353 pounds (615 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 W, which means 168 mph (270 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. 
Rear Tire 245/40R17 91 


245 
This number indicates that your tire has a width of 245 millimeters. 

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 98.00 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. 

91 
This tire has a load index of 91, which means it's capable of carrying a load of 1353 pounds (615 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 W, which means 168 mph (270 km/h) is the maximum speed that can be sustained for 10 minutes. A higher speed becomes dangerous. 