275/70R18 Tire Size Specifications
Complete dimensional breakdown in inches and millimeters, approved wheel rim widths, vehicle fitments, speedometer error tables, and safe plus-sizing alternatives.
275/70R18 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 | 33.16 in | 842.3 mm |
| Section Width (Cross-section) | 10.83 in | 275 mm |
| Sidewall Cushion Height | 7.58 in | 192.5 mm |
| Circumference (Rolling Distance) | 104.17 in | 2645.9 mm |
| Revolutions per Distance | 627 revs/mile | 390 revs/km |
| Wheel Rim Diameter | 18 in | 457.2 mm |
| Approved Rim Width Range | 7.4" – 9.6" | 188 – 244 mm |
| Measuring / Ideal Rim Width | 8.5 in | 216 mm |
| Aspect Ratio (Profile %) | 70% of section width | |
What 275/70R18 Is Typically Used For
Dimensions in this range are typical of pickups, SUVs and off-road fitments, where load capacity and sidewall strength matter more than steering response.
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 275/70R18 (±3% Rule)
These tire sizes stay within 3% of the 33.16" original diameter, keeping speedometer error minimal and preventing ABS/traction control faults.
Popular Comparisons with 275/70R18
Frequently Asked Questions about 275/70R18
What size is 275/70R18 in inches?
The 275/70R18 tire measures approximately 33.16" in overall diameter, 10.83" in section width (tread/sidewall cross-section), and is mounted on a 18" diameter wheel rim.
What rim width is recommended for 275/70R18?
The approved rim width range for 275/70R18 is 7.4" to 9.6" wide, with an ideal measuring rim width of 8.5" for optimal tread contact and even wear.
What are the closest safe alternative sizes for 275/70R18?
The closest safe tire sizes within the industry standard ±3% diameter limit include 285/70R17. These sizes maintain accurate speedometer calibration and clearance.
How many revolutions per mile does 275/70R18 make?
A standard 275/70R18 tire rotates approximately 627 revolutions per mile (390 revs per kilometer) at normal inflation pressure and rolling radius.