Tire Ruler245/70R17 dimensions
| Overall diameter (height) | 30.50″ · 775 mm |
| Section width | 9.65″ · 245 mm |
| Sidewall height | 6.75″ · 172 mm |
| Wheel diameter | 17″ |
| Rim width (rule of thumb) | 7–8.5″ |
| Circumference | 95.8″ |
| Revolutions per mile | 661 |
| In inches (flotation style) | 30.5 × 9.6R17 |
How it’s calculated: the sidewall is 70% of the 245 mm width = 171.5 mm (6.75″). Add two sidewalls to the 17″ wheel: 17 + 2 × 6.75 = 30.50″.
Bigger tires than 245/70R17 on 17″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 255/70R17 | 31.1″ | +0.55″ (+1.8%) | 61.1 mph |
| 275/65R17 | 31.1″ | +0.57″ (+1.9%) | 61.1 mph |
| 245/75R17 | 31.5″ | +0.96″ (+3.2%) | 61.9 mph |
| 265/70R17 | 31.6″ | +1.10″ (+3.6%) | 62.2 mph |
| 255/75R17 | 32.1″ | +1.56″ (+5.1%) | 63.1 mph |
“60 mph reads” is your real speed when a speedometer set up for 245/70R17 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 245/70R17
Within 1.5% of the same height on a 17″ wheel. Usually interchangeable for the speedometer; check width, load index and clearance.
| Size | Height | Width | Difference |
|---|---|---|---|
| 265/65R17 | 30.6″ | 10.4″ | +0.2% |
| 255/65R17 | 30.1″ | 10.0″ | −1.5% |
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 245/75R16: 30.5″ tall on a 16″ wheel (−0.1%)
- 265/70R16: 30.6″ tall on a 16″ wheel (+0.3%)
- 255/70R16: 30.1″ tall on a 16″ wheel (−1.5%)
- 215/85R16: 30.4″ tall on a 16″ wheel (−0.4%)
- 265/60R18: 30.5″ tall on an 18″ wheel (+0.1%)
- 245/65R18: 30.5″ tall on an 18″ wheel (+0.1%)
- 265/50R20: 30.4″ tall on a 20″ wheel (−0.2%)
- 275/50R20: 30.8″ tall on a 20″ wheel (+1.1%)
- 265/45R21: 30.4″ tall on a 21″ wheel (−0.4%)
- 275/45R21: 30.7″ tall on a 21″ wheel (+0.8%)
- 265/40R22: 30.3″ tall on a 22″ wheel (−0.5%)
Popular 245/70R17 comparisons
Frequently asked questions
Is 245/70R17 a 31 inch tire?
Not quite. 245/70R17 is 30.50 inches tall, between a 30 and a 31 inch tire.
What size is 245/70R17 in inches?
245/70R17 is 30.5 inches tall (overall diameter), 9.6 inches wide, with a 6.8 inch sidewall, and fits a 17 inch wheel.
What tire size is equivalent to 245/70R17?
Sizes within 1.5% of the same diameter on a 17" wheel: 265/65R17 (30.6"), 255/65R17 (30.1"). Check load index and width before swapping.
What rim width fits 245/70R17?
As a rule of thumb, about 7–8.5 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 245/70R17 make?
About 661 revolutions per mile in theory (circumference 95.8 in). Real tires turn slightly more because they flatten under load.