Tire Ruler285/60R20 dimensions
| Overall diameter (height) | 33.46″ · 850 mm |
| Section width | 11.22″ · 285 mm |
| Sidewall height | 6.73″ · 171 mm |
| Wheel diameter | 20″ |
| Rim width (rule of thumb) | 8–10″ |
| Circumference | 105.1″ |
| Revolutions per mile | 603 |
| In inches (flotation style) | 33.5 × 11.2R20 |
How it’s calculated: the sidewall is 60% of the 285 mm width = 171.0 mm (6.73″). Add two sidewalls to the 20″ wheel: 20 + 2 × 6.73 = 33.46″.
Bigger tires than 285/60R20 on 20″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 295/60R20 | 33.9″ | +0.47″ (+1.4%) | 60.8 mph |
| 34x11.50R20 | 34.0″ | +0.54″ (+1.6%) | 61.0 mph |
| 275/65R20 | 34.1″ | +0.61″ (+1.8%) | 61.1 mph |
| 285/65R20 | 34.6″ | +1.12″ (+3.4%) | 62.0 mph |
| 35x12.50R20 | 35.0″ | +1.54″ (+4.6%) | 62.8 mph |
“60 mph reads” is your real speed when a speedometer set up for 285/60R20 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 285/60R20
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 |
|---|---|---|---|
| 265/65R20 | 33.6″ | 10.4″ | +0.3% |
| 305/55R20 | 33.2″ | 12.0″ | −0.8% |
| 33x12.50R20 | 33.0″ | 12.5″ | −1.4% |
| 275/60R20 | 33.0″ | 10.8″ | −1.4% |
| 295/60R20 | 33.9″ | 11.6″ | +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:
- 33x12.50R15: 33.0″ tall on a 15″ wheel (−1.4%)
- 295/70R17: 33.3″ tall on a 17″ wheel (−0.6%)
- 285/75R17: 33.8″ tall on a 17″ wheel (+1.1%)
- 255/80R17: 33.1″ tall on a 17″ wheel (−1.2%)
- 33x12.50R17: 33.0″ tall on a 17″ wheel (−1.4%)
- 275/70R18: 33.2″ tall on an 18″ wheel (−0.9%)
- 33x12.50R18: 33.0″ tall on an 18″ wheel (−1.4%)
- 33x12.50R22: 33.0″ tall on a 22″ wheel (−1.4%)
Popular 285/60R20 comparisons
Frequently asked questions
Is 285/60R20 a 33 inch tire?
Not quite. 285/60R20 is 33.46 inches tall, between a 33 and a 34 inch tire.
What size is 285/60R20 in inches?
285/60R20 is 33.5 inches tall (overall diameter), 11.2 inches wide, with a 6.7 inch sidewall, and fits a 20 inch wheel.
What tire size is equivalent to 285/60R20?
Sizes within 1.5% of the same diameter on a 20" wheel: 265/65R20 (33.6"), 305/55R20 (33.2"), 33x12.50R20 (33.0"), 275/60R20 (33.0"). Check load index and width before swapping.
What rim width fits 285/60R20?
As a rule of thumb, about 8–10 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 285/60R20 make?
About 603 revolutions per mile in theory (circumference 105.1 in). Real tires turn slightly more because they flatten under load.