Tire Ruler275/65R20 dimensions
| Overall diameter (height) | 34.07″ · 865 mm |
| Section width | 10.83″ · 275 mm |
| Sidewall height | 7.04″ · 179 mm |
| Wheel diameter | 20″ |
| Rim width (rule of thumb) | 7.5–9.5″ |
| Circumference | 107.0″ |
| Revolutions per mile | 592 |
| In inches (flotation style) | 34.1 × 10.8R20 |
How it’s calculated: the sidewall is 65% of the 275 mm width = 178.8 mm (7.04″). Add two sidewalls to the 20″ wheel: 20 + 2 × 7.04 = 34.07″.
Bigger tires than 275/65R20 on 20″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 285/65R20 | 34.6″ | +0.51″ (+1.5%) | 60.9 mph |
| 35x12.50R20 | 35.0″ | +0.93″ (+2.7%) | 61.6 mph |
| 35x13.50R20 | 35.0″ | +0.93″ (+2.7%) | 61.6 mph |
| 295/65R20 | 35.1″ | +1.02″ (+3.0%) | 61.8 mph |
| 325/60R20 | 35.4″ | +1.28″ (+3.8%) | 62.3 mph |
“60 mph reads” is your real speed when a speedometer set up for 275/65R20 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 275/65R20
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 |
|---|---|---|---|
| 34x11.50R20 | 34.0″ | 11.5″ | −0.2% |
| 295/60R20 | 33.9″ | 11.6″ | −0.4% |
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 315/70R17: 34.4″ tall on a 17″ wheel (+0.8%)
- 285/75R17: 33.8″ tall on a 17″ wheel (−0.7%)
- 34x10.50R17: 34.0″ tall on a 17″ wheel (−0.2%)
- 295/70R18: 34.3″ tall on an 18″ wheel (+0.5%)
Popular 275/65R20 comparisons
Frequently asked questions
Is 275/65R20 a 34 inch tire?
Yes. 275/65R20 is 34.07 inches tall, so it's sold and talked about as a 34-inch tire.
What size is 275/65R20 in inches?
275/65R20 is 34.1 inches tall (overall diameter), 10.8 inches wide, with a 7.0 inch sidewall, and fits a 20 inch wheel.
What tire size is equivalent to 275/65R20?
Sizes within 1.5% of the same diameter on a 20" wheel: 34x11.50R20 (34.0"), 295/60R20 (33.9"). Check load index and width before swapping.
What rim width fits 275/65R20?
As a rule of thumb, about 7.5–9.5 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 275/65R20 make?
About 592 revolutions per mile in theory (circumference 107.0 in). Real tires turn slightly more because they flatten under load.