Tire Ruler265/65R18 dimensions
| Overall diameter (height) | 31.56″ · 802 mm |
| Section width | 10.43″ · 265 mm |
| Sidewall height | 6.78″ · 172 mm |
| Wheel diameter | 18″ |
| Rim width (rule of thumb) | 7.5–9″ |
| Circumference | 99.2″ |
| Revolutions per mile | 639 |
| In inches (flotation style) | 31.6 × 10.4R18 |
How it’s calculated: the sidewall is 65% of the 265 mm width = 172.3 mm (6.78″). Add two sidewalls to the 18″ wheel: 18 + 2 × 6.78 = 31.56″.
Bigger tires than 265/65R18 on 18″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 255/70R18 | 32.1″ | +0.49″ (+1.6%) | 60.9 mph |
| 275/65R18 | 32.1″ | +0.51″ (+1.6%) | 61.0 mph |
| 285/65R18 | 32.6″ | +1.02″ (+3.2%) | 61.9 mph |
| 265/70R18 | 32.6″ | +1.04″ (+3.3%) | 62.0 mph |
| 33x12.50R18 | 33.0″ | +1.44″ (+4.6%) | 62.7 mph |
“60 mph reads” is your real speed when a speedometer set up for 265/65R18 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:
- 32x11.50R15: 32.0″ tall on a 15″ wheel (+1.4%)
- 265/75R16: 31.6″ tall on a 16″ wheel (+0.3%)
- 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%)
- 275/55R20: 31.9″ tall on a 20″ wheel (+1.1%)
- 245/60R20: 31.6″ tall on a 20″ wheel (+0.0%)
- 285/50R20: 31.2″ tall on a 20″ wheel (−1.1%)
- 305/50R20: 32.0″ tall on a 20″ wheel (+1.4%)
- 275/45R22: 31.7″ tall on a 22″ wheel (+0.6%)
Popular 265/65R18 comparisons
Frequently asked questions
Is 265/65R18 a 32 inch tire?
Not quite. 265/65R18 is 31.56 inches tall, between a 31 and a 32 inch tire.
What size is 265/65R18 in inches?
265/65R18 is 31.6 inches tall (overall diameter), 10.4 inches wide, with a 6.8 inch sidewall, and fits an 18 inch wheel.
What tire size is equivalent to 265/65R18?
No common size on an 18" wheel is within 1.5% of 265/65R18's diameter. Use the calculator above to compare any size.
What rim width fits 265/65R18?
As a rule of thumb, about 7.5–9 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 265/65R18 make?
About 639 revolutions per mile in theory (circumference 99.2 in). Real tires turn slightly more because they flatten under load.