Tire Ruler265/65R20 dimensions
| Overall diameter (height) | 33.56″ · 853 mm |
| Section width | 10.43″ · 265 mm |
| Sidewall height | 6.78″ · 172 mm |
| Wheel diameter | 20″ |
| Rim width (rule of thumb) | 7.5–9″ |
| Circumference | 105.4″ |
| Revolutions per mile | 601 |
| In inches (flotation style) | 33.6 × 10.4R20 |
How it’s calculated: the sidewall is 65% of the 265 mm width = 172.3 mm (6.78″). Add two sidewalls to the 20″ wheel: 20 + 2 × 6.78 = 33.56″.
Bigger tires than 265/65R20 on 20″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 295/60R20 | 33.9″ | +0.37″ (+1.1%) | 60.7 mph |
| 34x11.50R20 | 34.0″ | +0.44″ (+1.3%) | 60.8 mph |
| 275/65R20 | 34.1″ | +0.51″ (+1.5%) | 60.9 mph |
| 285/65R20 | 34.6″ | +1.02″ (+3.0%) | 61.8 mph |
| 35x12.50R20 | 35.0″ | +1.44″ (+4.3%) | 62.6 mph |
“60 mph reads” is your real speed when a speedometer set up for 265/65R20 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 265/65R20
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 |
|---|---|---|---|
| 285/60R20 | 33.5″ | 11.2″ | −0.3% |
| 305/55R20 | 33.2″ | 12.0″ | −1.1% |
| 295/60R20 | 33.9″ | 11.6″ | +1.1% |
| 34x11.50R20 | 34.0″ | 11.5″ | +1.3% |
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 295/70R17: 33.3″ tall on a 17″ wheel (−0.9%)
- 285/75R17: 33.8″ tall on a 17″ wheel (+0.8%)
- 255/80R17: 33.1″ tall on a 17″ wheel (−1.5%)
- 34x10.50R17: 34.0″ tall on a 17″ wheel (+1.3%)
- 275/70R18: 33.2″ tall on an 18″ wheel (−1.2%)
Popular 265/65R20 comparisons
Frequently asked questions
Is 265/65R20 a 34 inch tire?
Not quite. 265/65R20 is 33.56 inches tall, between a 33 and a 34 inch tire.
What size is 265/65R20 in inches?
265/65R20 is 33.6 inches tall (overall diameter), 10.4 inches wide, with a 6.8 inch sidewall, and fits a 20 inch wheel.
What tire size is equivalent to 265/65R20?
Sizes within 1.5% of the same diameter on a 20" wheel: 285/60R20 (33.5"), 305/55R20 (33.2"), 295/60R20 (33.9"), 34x11.50R20 (34.0"). Check load index and width before swapping.
What rim width fits 265/65R20?
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 265/65R20 make?
About 601 revolutions per mile in theory (circumference 105.4 in). Real tires turn slightly more because they flatten under load.