Tire Ruler255/70R16 dimensions
| Overall diameter (height) | 30.06″ · 763 mm |
| Section width | 10.04″ · 255 mm |
| Sidewall height | 7.03″ · 179 mm |
| Wheel diameter | 16″ |
| Rim width (rule of thumb) | 7–9″ |
| Circumference | 94.4″ |
| Revolutions per mile | 671 |
| In inches (flotation style) | 30.1 × 10.0R16 |
How it’s calculated: the sidewall is 70% of the 255 mm width = 178.5 mm (7.03″). Add two sidewalls to the 16″ wheel: 16 + 2 × 7.03 = 30.06″.
Bigger tires than 255/70R16 on 16″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 215/85R16 | 30.4″ | +0.33″ (+1.1%) | 60.7 mph |
| 245/75R16 | 30.5″ | +0.41″ (+1.4%) | 60.8 mph |
| 265/70R16 | 30.6″ | +0.55″ (+1.8%) | 61.1 mph |
| 265/75R16 | 31.6″ | +1.59″ (+5.3%) | 63.2 mph |
| 235/85R16 | 31.7″ | +1.67″ (+5.6%) | 63.3 mph |
“60 mph reads” is your real speed when a speedometer set up for 255/70R16 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 255/70R16
Within 1.5% of the same height on a 16″ wheel. Usually interchangeable for the speedometer; check width, load index and clearance.
| Size | Height | Width | Difference |
|---|---|---|---|
| 235/75R16 | 29.9″ | 9.3″ | −0.6% |
| 215/85R16 | 30.4″ | 8.5″ | +1.1% |
| 245/75R16 | 30.5″ | 9.6″ | +1.4% |
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 30x9.50R15: 30.0″ tall on a 15″ wheel (−0.2%)
- 245/70R17: 30.5″ tall on a 17″ wheel (+1.5%)
- 255/65R17: 30.1″ tall on a 17″ wheel (−0.0%)
- 235/70R17: 30.0″ tall on a 17″ wheel (−0.3%)
- 235/65R18: 30.0″ tall on an 18″ wheel (−0.1%)
- 255/55R19: 30.0″ tall on a 19″ wheel (−0.0%)
- 245/55R19: 29.6″ tall on a 19″ wheel (−1.5%)
- 265/50R20: 30.4″ tall on a 20″ wheel (+1.3%)
- 255/50R20: 30.0″ tall on a 20″ wheel (−0.1%)
- 245/50R20: 29.6″ tall on a 20″ wheel (−1.4%)
- 275/45R20: 29.7″ tall on a 20″ wheel (−1.0%)
- 265/45R21: 30.4″ tall on a 21″ wheel (+1.1%)
- 265/40R22: 30.3″ tall on a 22″ wheel (+1.0%)
Popular 255/70R16 comparisons
Frequently asked questions
Is 255/70R16 a 30 inch tire?
Yes. 255/70R16 is 30.06 inches tall, so it's sold and talked about as a 30-inch tire.
What size is 255/70R16 in inches?
255/70R16 is 30.1 inches tall (overall diameter), 10.0 inches wide, with a 7.0 inch sidewall, and fits a 16 inch wheel.
What tire size is equivalent to 255/70R16?
Sizes within 1.5% of the same diameter on a 16" wheel: 235/75R16 (29.9"), 215/85R16 (30.4"), 245/75R16 (30.5"). Check load index and width before swapping.
What rim width fits 255/70R16?
As a rule of thumb, about 7–9 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 255/70R16 make?
About 671 revolutions per mile in theory (circumference 94.4 in). Real tires turn slightly more because they flatten under load.