Tire Ruler245/60R18 dimensions
| Overall diameter (height) | 29.57″ · 751 mm |
| Section width | 9.65″ · 245 mm |
| Sidewall height | 5.79″ · 147 mm |
| Wheel diameter | 18″ |
| Rim width (rule of thumb) | 7–8.5″ |
| Circumference | 92.9″ |
| Revolutions per mile | 682 |
| In inches (flotation style) | 29.6 × 9.6R18 |
How it’s calculated: the sidewall is 60% of the 245 mm width = 147.0 mm (5.79″). Add two sidewalls to the 18″ wheel: 18 + 2 × 5.79 = 29.57″.
Bigger tires than 245/60R18 on 18″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 235/65R18 | 30.0″ | +0.45″ (+1.5%) | 60.9 mph |
| 265/60R18 | 30.5″ | +0.94″ (+3.2%) | 61.9 mph |
| 245/65R18 | 30.5″ | +0.96″ (+3.3%) | 62.0 mph |
| 275/60R18 | 31.0″ | +1.42″ (+4.8%) | 62.9 mph |
| 255/65R18 | 31.1″ | +1.48″ (+5.0%) | 63.0 mph |
“60 mph reads” is your real speed when a speedometer set up for 245/60R18 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
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 (+1.4%)
- 235/75R16: 29.9″ tall on a 16″ wheel (+1.0%)
- 225/75R16: 29.3″ tall on a 16″ wheel (−1.0%)
- 245/70R16: 29.5″ tall on a 16″ wheel (−0.2%)
- 245/65R17: 29.5″ tall on a 17″ wheel (−0.1%)
- 235/70R17: 30.0″ tall on a 17″ wheel (+1.3%)
- 235/55R19: 29.2″ tall on a 19″ wheel (−1.3%)
- 245/55R19: 29.6″ tall on a 19″ wheel (+0.1%)
- 245/50R20: 29.6″ tall on a 20″ wheel (+0.2%)
- 275/45R20: 29.7″ tall on a 20″ wheel (+0.6%)
- 265/45R20: 29.4″ tall on a 20″ wheel (−0.6%)
Popular 245/60R18 comparisons
Frequently asked questions
Is 245/60R18 a 30 inch tire?
Not quite. 245/60R18 is 29.57 inches tall, between a 29 and a 30 inch tire.
What size is 245/60R18 in inches?
245/60R18 is 29.6 inches tall (overall diameter), 9.6 inches wide, with a 5.8 inch sidewall, and fits an 18 inch wheel.
What tire size is equivalent to 245/60R18?
No common size on an 18" wheel is within 1.5% of 245/60R18's diameter. Use the calculator above to compare any size.
What rim width fits 245/60R18?
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 245/60R18 make?
About 682 revolutions per mile in theory (circumference 92.9 in). Real tires turn slightly more because they flatten under load.