225/60R18 Tire Size Specifications
Complete dimensional breakdown in inches and millimeters, approved wheel rim widths, vehicle fitments, speedometer error tables, and safe plus-sizing alternatives.
225/60R18 Technical Dimension Table
Standardized measurements computed according to ETRTO & ISO 4000-1 passenger and commercial tire design formulas.
| Specification Property | Imperial (Inches / Miles) | Metric (Millimeters / Kilometers) |
|---|---|---|
| Overall Rolling Diameter | 28.63 in | 727.2 mm |
| Section Width (Cross-section) | 8.86 in | 225 mm |
| Sidewall Cushion Height | 5.31 in | 134.9 mm |
| Circumference (Rolling Distance) | 89.94 in | 2284.5 mm |
| Revolutions per Distance | 726 revs/mile | 451 revs/km |
| Wheel Rim Diameter | 18 in | 457.2 mm |
| Approved Rim Width Range | 6.1" – 7.9" | 155 – 201 mm |
| Measuring / Ideal Rim Width | 7.0 in | 178 mm |
| Aspect Ratio (Profile %) | 60% of section width | |
What 225/60R18 Is Typically Used For
Dimensions in this range are the mainstream touring fitment, tuned for ride comfort, efficiency and year-round availability.
To find the size your specific vehicle takes, check the placard on the driver-side door jamb or your owner's manual. Fitment depends on model year, trim, brake caliper clearance, wheel offset and suspension setup, so the correct size for your car is the one the manufacturer specifies.
Safe Alternative Sizes for 225/60R18 (±3% Rule)
These tire sizes stay within 3% of the 28.63" original diameter, keeping speedometer error minimal and preventing ABS/traction control faults.
Popular Comparisons with 225/60R18
Frequently Asked Questions about 225/60R18
What size is 225/60R18 in inches?
The 225/60R18 tire measures approximately 28.63" in overall diameter, 8.86" in section width (tread/sidewall cross-section), and is mounted on a 18" diameter wheel rim.
What rim width is recommended for 225/60R18?
The approved rim width range for 225/60R18 is 6.1" to 7.9" wide, with an ideal measuring rim width of 7.0" for optimal tread contact and even wear.
What are the closest safe alternative sizes for 225/60R18?
The closest safe tire sizes within the industry standard ±3% diameter limit include 245/55R18. These sizes maintain accurate speedometer calibration and clearance.
How many revolutions per mile does 225/60R18 make?
A standard 225/60R18 tire rotates approximately 726 revolutions per mile (451 revs per kilometer) at normal inflation pressure and rolling radius.