265/70R18 dimensions
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 32.61 in | 828 mm |
| Section width | 10.43 in | 265 mm |
| Sidewall height | 7.30 in | 185.5 mm |
| Wheel diameter | 18 in | 457 mm |
| Circumference | 102.4 in | 2,602 mm |
| Revolutions per mile | 618.5 |
The math
| Step | Math | Result |
|---|---|---|
| Sidewall | 265 × 70% = 185.5 mm ÷ 25.4 | 7.30 in |
| Overall height | 18 + 2 × 7.30 | 32.61 in |
| Width | 265 mm ÷ 25.4 | 10.43 in |
| Circumference | π × 32.61 | 102.4 in |
| Revs per mile | 63,360 ÷ 102.4 | 618.5 |
With a 7.3 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 18 in wheel
Each row changes one thing and shows the height change against 265/70R18, 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 | 275/70R18 (compare) | 33.2 in | +1.7% | 61.0 mph | Close match |
| Narrower | 255/70R18 (compare) | 32.1 in | -1.7% | 59.0 mph | Close match |
| Taller sidewall | 265/75R18 (compare) | 33.6 in | +3.2% | 61.9 mph | Check clearance |
| Shorter sidewall | 265/65R18 (compare) | 31.6 in | -3.2% | 58.1 mph | Check clearance |
| Wider, shorter sidewall | 275/65R18 (compare) | 32.1 in | -1.6% | 59.0 mph | Close match |
| Narrower, taller sidewall | 255/75R18 (compare) | 33.1 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.
17 in wheels (one wheel size smaller)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 265/75R17 (compare) | 32.6 in | +0.1% | +0 mm |
| 285/70R17 (compare) | 32.7 in | +0.3% | +20 mm |
| 235/85R17 (compare) | 32.7 in | +0.4% | -30 mm |
| 245/80R17 (compare) | 32.4 in | -0.5% | -20 mm |
19 in wheels (one wheel size larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 265/65R19 (compare) | 32.6 in | -0.1% | +0 mm |
| 245/70R19 (compare) | 32.5 in | -0.3% | -20 mm |
| 285/60R19 (compare) | 32.5 in | -0.4% | +20 mm |
| 235/75R19 (compare) | 32.9 in | +0.8% | -30 mm |
20 in wheels (two wheel sizes larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 245/65R20 (compare) | 32.5 in | -0.2% | -20 mm |
| 265/60R20 (compare) | 32.5 in | -0.3% | +0 mm |
| 295/55R20 (compare) | 32.8 in | +0.5% | +30 mm |
| 285/55R20 (compare) | 32.3 in | -0.8% | +20 mm |
Try it with your numbers
Compare 265/70R18 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 · 265/65R18 · 275/60R18.