255/75R17 dimensions
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 32.06 in | 814 mm |
| Section width | 10.04 in | 255 mm |
| Sidewall height | 7.53 in | 191.2 mm |
| Wheel diameter | 17 in | 432 mm |
| Circumference | 100.7 in | 2,558 mm |
| Revolutions per mile | 629.1 |
The math
| Step | Math | Result |
|---|---|---|
| Sidewall | 255 × 75% = 191.2 mm ÷ 25.4 | 7.53 in |
| Overall height | 17 + 2 × 7.53 | 32.06 in |
| Width | 255 mm ÷ 25.4 | 10.04 in |
| Circumference | π × 32.06 | 100.7 in |
| Revs per mile | 63,360 ÷ 100.7 | 629.1 |
With a 7.5 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 17 in wheel
Each row changes one thing and shows the height change against 255/75R17, 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 | 265/75R17 (compare) | 32.6 in | +1.8% | 61.1 mph | Close match |
| Narrower | 245/75R17 (compare) | 31.5 in | -1.8% | 58.9 mph | Close match |
| Taller sidewall | 255/80R17 (compare) | 33.1 in | +3.1% | 61.9 mph | Check clearance |
| Shorter sidewall | 255/70R17 (compare) | 31.1 in | -3.1% | 58.1 mph | Check clearance |
| Wider, shorter sidewall | 265/70R17 (compare) | 31.6 in | -1.4% | 59.2 mph | Close match |
| Narrower, taller sidewall | 245/80R17 (compare) | 32.4 in | +1.2% | 60.7 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.
16 in wheels (one wheel size smaller)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 255/80R16 (compare) | 32.1 in | +0.0% | +0 mm |
| 275/75R16 (compare) | 32.2 in | +0.6% | +20 mm |
| 235/85R16 (compare) | 31.7 in | -1.0% | -20 mm |
| 245/85R16 (compare) | 32.4 in | +1.1% | -10 mm |
18 in wheels (one wheel size larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 255/70R18 (compare) | 32.1 in | -0.0% | +0 mm |
| 275/65R18 (compare) | 32.1 in | +0.0% | +20 mm |
| 225/80R18 (compare) | 32.2 in | +0.4% | -30 mm |
| 235/75R18 (compare) | 31.9 in | -0.6% | -20 mm |
19 in wheels (two wheel sizes larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 255/65R19 (compare) | 32.1 in | -0.0% | +0 mm |
| 275/60R19 (compare) | 32.0 in | -0.2% | +20 mm |
| 235/70R19 (compare) | 32.0 in | -0.3% | -20 mm |
| 225/75R19 (compare) | 32.3 in | +0.7% | -30 mm |
Try it with your numbers
Compare 255/75R17 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 · 255/70R17 · 255/80R17.