Enter your Tire Width, Aspect Ratio, Rim Diameter, and preferred Unit System into the Tire Aspect Ratio Calculator to find your Sidewall Height, along with Overall Diameter, Circumference, and Revolutions per Mile — everything you need to understand what's actually rolling beneath your car.
Sidewall Height
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Overall Diameter
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Circumference
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Revolutions per Mile
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Tire aspect ratio is the percentage of the tire's sidewall height relative to its width. For example, if a tire is 225mm wide with a 60 aspect ratio, the sidewall height is 60% of 225mm, which equals 135mm.
The aspect ratio is the two-digit number after the tire width in tire size markings. It represents the tire's sidewall height as a percentage of the tire's width. Lower numbers mean shorter sidewalls and typically better handling.
Tire sizes are written as width/aspect ratio/rim diameter. For example, 225/60R16 means 225mm width, 60% aspect ratio, and 16-inch rim diameter. The 'R' indicates radial construction.
Changing aspect ratio affects ride comfort, handling, and speedometer accuracy. Lower aspect ratios provide better handling but harsher ride. Higher ratios offer more comfort but less precise steering response.
Aspect ratio directly impacts overall tire diameter. The total diameter equals rim diameter plus twice the sidewall height. Changing aspect ratio while keeping width constant will change the overall diameter.
Yes, but you must maintain similar overall diameter to avoid speedometer errors and clearance issues. Use a tire size calculator to compare different combinations before making changes.
Common aspect ratios range from 40-70%. Performance tires typically use 40-55%, standard passenger tires use 60-65%, and SUV/truck tires often use 65-70% for better ride comfort and load capacity.