245/70R17 dimensions
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 30.50 in | 775 mm |
| Section width | 9.65 in | 245 mm |
| Sidewall height | 6.75 in | 171.5 mm |
| Wheel diameter | 17 in | 432 mm |
| Circumference | 95.8 in | 2,434 mm |
| Revolutions per mile | 661.2 |
The math
| Step | Math | Result |
|---|---|---|
| Sidewall | 245 × 70% = 171.5 mm ÷ 25.4 | 6.75 in |
| Overall height | 17 + 2 × 6.75 | 30.50 in |
| Width | 245 mm ÷ 25.4 | 9.65 in |
| Circumference | π × 30.50 | 95.8 in |
| Revs per mile | 63,360 ÷ 95.8 | 661.2 |
With a 6.8 in sidewall this is a tall sidewall with more 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 245/70R17, 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 | 255/70R17 (compare) | 31.1 in | +1.8% | 61.1 mph | Close match |
| Narrower | 235/70R17 (compare) | 30.0 in | -1.8% | 58.9 mph | Close match |
| Taller sidewall | 245/75R17 (compare) | 31.5 in | +3.2% | 61.9 mph | Check clearance |
| Shorter sidewall | 245/65R17 (compare) | 29.5 in | -3.2% | 58.1 mph | Check clearance |
| Wider, shorter sidewall | 255/65R17 (compare) | 30.1 in | -1.5% | 59.1 mph | Close match |
| Narrower, taller sidewall | 235/75R17 (compare) | 30.9 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 |
|---|---|---|---|
| 245/75R16 (compare) | 30.5 in | -0.1% | +0 mm |
| 265/70R16 (compare) | 30.6 in | +0.3% | +20 mm |
| 215/85R16 (compare) | 30.4 in | -0.4% | -30 mm |
| 235/80R16 (compare) | 30.8 in | +1.0% | -10 mm |
18 in wheels (one wheel size larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 265/60R18 (compare) | 30.5 in | +0.1% | +20 mm |
| 245/65R18 (compare) | 30.5 in | +0.1% | +0 mm |
| 225/70R18 (compare) | 30.4 in | -0.3% | -20 mm |
| 215/75R18 (compare) | 30.7 in | +0.6% | -30 mm |
19 in wheels (two wheel sizes larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 225/65R19 (compare) | 30.5 in | +0.0% | -20 mm |
| 265/55R19 (compare) | 30.5 in | -0.1% | +20 mm |
| 245/60R19 (compare) | 30.6 in | +0.2% | +0 mm |
| 215/70R19 (compare) | 30.9 in | +1.1% | -30 mm |
Try it with your numbers
Compare 245/70R17 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 · 245/65R17 · 245/75R17.