255/70R17 Tire Size Specifications
Complete dimensional breakdown in inches and millimeters, approved wheel rim widths, vehicle fitments, speedometer error tables, and safe plus-sizing alternatives.
255/70R17 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 | 31.06 in | 788.9 mm |
| Section Width (Cross-section) | 10.04 in | 255 mm |
| Sidewall Cushion Height | 7.03 in | 178.6 mm |
| Circumference (Rolling Distance) | 97.56 in | 2478 mm |
| Revolutions per Distance | 670 revs/mile | 416 revs/km |
| Wheel Rim Diameter | 17 in | 431.8 mm |
| Approved Rim Width Range | 6.9" – 8.9" | 175 – 226 mm |
| Measuring / Ideal Rim Width | 7.9 in | 201 mm |
| Aspect Ratio (Profile %) | 70% of section width | |
What 255/70R17 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 255/70R17 (±3% Rule)
These tire sizes stay within 3% of the 31.06" original diameter, keeping speedometer error minimal and preventing ABS/traction control faults.
Popular Comparisons with 255/70R17
Frequently Asked Questions about 255/70R17
What size is 255/70R17 in inches?
The 255/70R17 tire measures approximately 31.06" in overall diameter, 10.04" in section width (tread/sidewall cross-section), and is mounted on a 17" diameter wheel rim.
What rim width is recommended for 255/70R17?
The approved rim width range for 255/70R17 is 6.9" to 8.9" wide, with an ideal measuring rim width of 7.9" for optimal tread contact and even wear.
What are the closest safe alternative sizes for 255/70R17?
The closest safe tire sizes within the industry standard ±3% diameter limit include 275/65R17. These sizes maintain accurate speedometer calibration and clearance.
How many revolutions per mile does 255/70R17 make?
A standard 255/70R17 tire rotates approximately 670 revolutions per mile (416 revs per kilometer) at normal inflation pressure and rolling radius.