Question about Mercedes-Benz SL-Class

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MY OLD 1990 MERCEDES 500 SL HAS 225 55 R16 TIRES ON IT .I DRIVE IT SO LITTLE (87,000) (MY 73 I DROVE 7000 IN 10 YEARS) BECAUSE OF COST CAN I PUT A DIFFERENT TIRE ON IT SUCH AS A 225 60 16.IT HAS STOCK M/B RIMMS. I NEED TO SAVE WHERE I CAN THANKS DENNIS

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  • weldersib Aug 02, 2010

    i DONT'T WANT TO BUY TIRES THAT I AM NOT SURE ARE GOING TO WORK UNTILL I HAVE THEM INSTALLED.IS THERE SOME ONE OR SOME WHERE THAT I CAN GO TO SEE THE TIRES THAT WILL FIT AND AND NOT HAVE TO WORRY AFTER THE PURCHASE

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  • Mercedes-Benz Master
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For 1990 MERCEDES-BENZ SL 500: 225/55ZR16 Z (Goodyear Tires)

Check HERE to calculate the approx. tire size that you could using.

Check this sample...
Step 1 Locate the OE tire size. This is located on the sidewall of the tire and looks similar to 245/75R16.
Step 2 Note the width of the tire. In the case of our example, 245/75R16, 245 represents the width across the tire, in millimeters, from the widest point.
Step 3 Calculate the sidewall height of the tire. In our example, 245/75R16, 75 represents the height of the tire's sidewall, from rim to tread, as a percentage of the the tire width. This is also known as the tire's series. The example tire has a sidewall height of 183.75 millimeters or 7.23 inches.
Step 4 Locate the wheel diameter. This is the last number in the tire size. In our example, 245/75R16, 16 is the wheel diameter, in inches, on which the tire is intended to be mounted.

Calculating Tire Diameter
Step 1 Calculate the overall tire height, in inches, using the information you gathered from steps 2 and 3 under "Reading Tire Size" with the following formula ((Width/25.4) x Sidewall Percentage) x2. Our example tire size, 245/75R16, would have an overall tire height of 14.47 inches (245/25.4x75% x2).
Step 2 Combine the overall tire height and wheel diameter. The example, 245/75R16, would add 14.47 to 16, resulting in a final tire diameter of 30.47 inches.
Step 3 Using the 3 percent variance rule, tires of equivalent size would be between 29.56 and 31.38 inches in total diameter.


  • Step 2 Note the width of the tire. In the case of our example, 245/75R16, 245 represents the width across the tire, in millimeters, from the widest point.
  • Step 3 Calculate the sidewall height of the tire. In our example, 245/75R16, 75 represents the height of the tire's sidewall, from rim to tread, as a percentage of the the tire width. This is also known as the tire's series. The example tire has a sidewall height of 183.75 millimeters or 7.23 inches.
  • Step 4 Locate the wheel diameter. This is the last number in the tire size. In our example, 245/75R16, 16 is the wheel diameter, in inches, on which the tire is intended to be mounted.
  • Calculating Tire Diameter
  • Step 1 Calculate the overall tire height, in inches, using the information you gathered from steps 2 and 3 under "Reading Tire Size" with the following formula ((Width/25.4) x Sidewall Percentage) x2. Our example tire size, 245/75R16, would have an overall tire height of 14.47 inches (245/25.4x75% x2).
  • Step 2 Combine the overall tire height and wheel diameter. The example, 245/75R16, would add 14.47 to 16, resulting in a final tire diameter of 30.47 inches.
  • Step 3 Using the 3 percent variance rule, tires of equivalent size would be between 29.56 and 31.38 inches in total diameter.

  • Read more: How to Find Tire Size Equivalents | eHow.com http://www.ehow.com/how_5964966_tire-size-equivalents.html#ixzz0vUcTN6lm
    The /55 or /60 is called the aspect ration and us use it as a percentage of the first number 225 to calculate the height of the tire's section, measured from the rim to the tread of the tire.

    In this case, you're looking at lowering the height of the tire by about 11 millimeters from 135 to 123. This is less than 1/2 an inch, so the effect on your car's ride, performance, etc. is very likely to be almost nothing.

    As for fitting on the original factory wheel, you're still using the same diamerter tire (R16) and the width of the tire is still the same (225) so unless the tire manufacturer recommends a different WIDTH of wheel from the one you have, you shouldn't have any problem. The chance of this is so low (based on the tires involved) that I wouldn't even bother to check, but if you really want to be sure, then get your tire dealer to check what size of wheel is recommended for this tire.
    Read more: plus-sizing

    MY OLD 1990 MERCEDES 500 - 5c515f3.jpg

    Hope helps.

    Posted on Aug 02, 2010

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    • Mercedes-Benz Master
    • 6,826 Answers

    I think that you could but you would have to check for rubbing in all positions of the steering wheel, since it is a step up in size before leaving the tire shop and driving on the open road.


    Posted on Aug 02, 2010

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