255/70R16 dimensions
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 30.06 in | 763 mm |
| Section width | 10.04 in | 255 mm |
| Sidewall height | 7.03 in | 178.5 mm |
| Wheel diameter | 16 in | 406 mm |
| Circumference | 94.4 in | 2,398 mm |
| Revolutions per mile | 671.0 |
The math
| Step | Math | Result |
|---|---|---|
| Sidewall | 255 × 70% = 178.5 mm ÷ 25.4 | 7.03 in |
| Overall height | 16 + 2 × 7.03 | 30.06 in |
| Width | 255 mm ÷ 25.4 | 10.04 in |
| Circumference | π × 30.06 | 94.4 in |
| Revs per mile | 63,360 ÷ 94.4 | 671.0 |
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 16 in wheel
Each row changes one thing and shows the height change against 255/70R16, 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 | 265/70R16 (compare) | 30.6 in | +1.8% | 61.1 mph | Close match |
| Narrower | 245/70R16 (compare) | 29.5 in | -1.8% | 58.9 mph | Close match |
| Taller sidewall | 255/75R16 (compare) | 31.1 in | +3.3% | 62.0 mph | Check clearance |
| Shorter sidewall | 255/65R16 (compare) | 29.1 in | -3.3% | 58.0 mph | Check clearance |
| Wider, shorter sidewall | 265/65R16 (compare) | 29.6 in | -1.6% | 59.0 mph | Close match |
| Narrower, taller sidewall | 245/75R16 (compare) | 30.5 in | +1.4% | 60.8 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.
15 in wheels (one wheel size smaller)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 225/85R15 (compare) | 30.1 in | +0.0% | -30 mm |
| 255/75R15 (compare) | 30.1 in | +0.0% | +0 mm |
| 275/70R15 (compare) | 30.2 in | +0.3% | +20 mm |
| 235/80R15 (compare) | 29.8 in | -0.8% | -20 mm |
17 in wheels (one wheel size larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 255/65R17 (compare) | 30.1 in | -0.0% | +0 mm |
| 275/60R17 (compare) | 30.0 in | -0.2% | +20 mm |
| 235/70R17 (compare) | 30.0 in | -0.3% | -20 mm |
| 225/75R17 (compare) | 30.3 in | +0.8% | -30 mm |
18 in wheels (two wheel sizes larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 255/60R18 (compare) | 30.0 in | -0.0% | +0 mm |
| 235/65R18 (compare) | 30.0 in | -0.1% | -20 mm |
| 275/55R18 (compare) | 29.9 in | -0.5% | +20 mm |
| 285/55R18 (compare) | 30.3 in | +1.0% | +30 mm |
Try it with your numbers
Compare 255/70R16 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 · 255/65R16 · 265/65R16.