275/65R20 dimensions
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 34.07 in | 866 mm |
| Section width | 10.83 in | 275 mm |
| Sidewall height | 7.04 in | 178.8 mm |
| Wheel diameter | 20 in | 508 mm |
| Circumference | 107.0 in | 2,719 mm |
| Revolutions per mile | 591.9 |
The math
| Step | Math | Result |
|---|---|---|
| Sidewall | 275 × 65% = 178.8 mm ÷ 25.4 | 7.04 in |
| Overall height | 20 + 2 × 7.04 | 34.07 in |
| Width | 275 mm ÷ 25.4 | 10.83 in |
| Circumference | π × 34.07 | 107.0 in |
| Revs per mile | 63,360 ÷ 107.0 | 591.9 |
With a 7.0 in sidewall this is a very tall sidewall, the kind seen on light-truck and off-road sizes, with plenty of cushion and flex. Real tires vary by brand and model, and the loaded radius under the vehicle is a bit smaller than this unloaded figure.
One step either way on a 20 in wheel
Each row changes one thing and shows the height change against 275/65R20, plus what 60 mph on the speedometer would really be if you swapped to that size.
| Change | Size | Height | Height change | 60 mph shows as | Verdict |
|---|---|---|---|---|---|
| Wider | 285/65R20 (compare) | 34.6 in | +1.5% | 60.9 mph | Close match |
| Narrower | 265/65R20 (compare) | 33.6 in | -1.5% | 59.1 mph | Close match |
| Taller sidewall | 275/70R20 (compare) | 35.2 in | +3.2% | 61.9 mph | Check clearance |
| Shorter sidewall | 275/60R20 (compare) | 33.0 in | -3.2% | 58.1 mph | Check clearance |
| Wider, shorter sidewall | 285/60R20 (compare) | 33.5 in | -1.8% | 58.9 mph | Close match |
| Narrower, taller sidewall | 265/70R20 (compare) | 34.6 in | +1.6% | 60.9 mph | Close match |
Calculated sizes within ±3% on other wheels
Plus and minus sizes that keep the overall height within about 3% (a rule of thumb from Discount Tire and 1010tires), widths within 30 mm. Calculated, not a list of tires on sale: check that a tire exists in that size.
19 in wheels (one wheel size smaller)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 255/75R19 (compare) | 34.1 in | -0.0% | -20 mm |
| 295/65R19 (compare) | 34.1 in | +0.1% | +20 mm |
| 275/70R19 (compare) | 34.2 in | +0.2% | +0 mm |
| 245/80R19 (compare) | 34.4 in | +1.1% | -30 mm |
21 in wheels (one wheel size larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 255/65R21 (compare) | 34.1 in | -0.1% | -20 mm |
| 275/60R21 (compare) | 34.0 in | -0.2% | +0 mm |
| 305/55R21 (compare) | 34.2 in | +0.4% | +30 mm |
| 295/55R21 (compare) | 33.8 in | -0.9% | +20 mm |
22 in wheels (two wheel sizes larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 255/60R22 (compare) | 34.0 in | -0.1% | -20 mm |
| 305/50R22 (compare) | 34.0 in | -0.2% | +30 mm |
| 275/55R22 (compare) | 33.9 in | -0.5% | +0 mm |
| 285/55R22 (compare) | 34.3 in | +0.8% | +10 mm |
Try it with your numbers
Compare 275/65R20 with another size · Convert to metric or find a 33 in size · Sizes that fit my wheel
Calculated from the size alone. Real tires vary a little by brand and model, and the loaded radius is a bit smaller. Confirm the wheel width range, clearance, load index and speed rating for your vehicle. See how to read a tire size, the load index chart and the speed rating chart.
Browse: all sizes in inches · 275/60R20 · 285/45R20.