Tire Ruler245/60R20 dimensions
| Overall diameter (height) | 31.57″ · 802 mm |
| Section width | 9.65″ · 245 mm |
| Sidewall height | 5.79″ · 147 mm |
| Wheel diameter | 20″ |
| Rim width (rule of thumb) | 7–8.5″ |
| Circumference | 99.2″ |
| Revolutions per mile | 639 |
| In inches (flotation style) | 31.6 × 9.6R20 |
How it’s calculated: the sidewall is 60% of the 245 mm width = 147.0 mm (5.79″). Add two sidewalls to the 20″ wheel: 20 + 2 × 5.79 = 31.57″.
Bigger tires than 245/60R20 on 20″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 275/55R20 | 31.9″ | +0.33″ (+1.1%) | 60.6 mph |
| 305/50R20 | 32.0″ | +0.43″ (+1.4%) | 60.8 mph |
| 285/55R20 | 32.3″ | +0.77″ (+2.4%) | 61.5 mph |
| 265/60R20 | 32.5″ | +0.94″ (+3.0%) | 61.8 mph |
| 295/55R20 | 32.8″ | +1.20″ (+3.8%) | 62.3 mph |
“60 mph reads” is your real speed when a speedometer set up for 245/60R20 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 245/60R20
Within 1.5% of the same height on a 20″ wheel. Usually interchangeable for the speedometer; check width, load index and clearance.
| Size | Height | Width | Difference |
|---|---|---|---|
| 275/55R20 | 31.9″ | 10.8″ | +1.1% |
| 285/50R20 | 31.2″ | 11.2″ | −1.1% |
| 305/50R20 | 32.0″ | 12.0″ | +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:
- 32x11.50R15: 32.0″ tall on a 15″ wheel (+1.3%)
- 265/75R16: 31.6″ tall on a 16″ wheel (+0.2%)
- 235/85R16: 31.7″ tall on a 16″ wheel (+0.5%)
- 265/70R17: 31.6″ tall on a 17″ wheel (+0.1%)
- 245/75R17: 31.5″ tall on a 17″ wheel (−0.3%)
- 265/65R18: 31.6″ tall on an 18″ wheel (−0.0%)
- 275/45R22: 31.7″ tall on a 22″ wheel (+0.5%)
Popular 245/60R20 comparisons
Frequently asked questions
Is 245/60R20 a 32 inch tire?
Not quite. 245/60R20 is 31.57 inches tall, between a 31 and a 32 inch tire.
What size is 245/60R20 in inches?
245/60R20 is 31.6 inches tall (overall diameter), 9.6 inches wide, with a 5.8 inch sidewall, and fits a 20 inch wheel.
What tire size is equivalent to 245/60R20?
Sizes within 1.5% of the same diameter on a 20" wheel: 275/55R20 (31.9"), 285/50R20 (31.2"), 305/50R20 (32.0"). Check load index and width before swapping.
What rim width fits 245/60R20?
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 245/60R20 make?
About 639 revolutions per mile in theory (circumference 99.2 in). Real tires turn slightly more because they flatten under load.