235/45R17 dimensions
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 25.33 in | 643 mm |
| Section width | 9.25 in | 235 mm |
| Sidewall height | 4.16 in | 105.8 mm |
| Wheel diameter | 17 in | 432 mm |
| Circumference | 79.6 in | 2,021 mm |
| Revolutions per mile | 796.3 |
The math
| Step | Math | Result |
|---|---|---|
| Sidewall | 235 × 45% = 105.8 mm ÷ 25.4 | 4.16 in |
| Overall height | 17 + 2 × 4.16 | 25.33 in |
| Width | 235 mm ÷ 25.4 | 9.25 in |
| Circumference | π × 25.33 | 79.6 in |
| Revs per mile | 63,360 ÷ 79.6 | 796.3 |
With a 4.2 in sidewall this is a medium sidewall: a balance of cushion and response. 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 235/45R17, 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 | 245/45R17 (compare) | 25.7 in | +1.4% | 60.8 mph | Close match |
| Narrower | 225/45R17 (compare) | 25.0 in | -1.4% | 59.2 mph | Close match |
| Taller sidewall | 235/50R17 (compare) | 26.3 in | +3.7% | 62.2 mph | Check clearance |
| Shorter sidewall | 235/40R17 (compare) | 24.4 in | -3.7% | 57.8 mph | Check clearance |
| Wider, shorter sidewall | 245/40R17 (compare) | 24.7 in | -2.4% | 58.6 mph | Close match |
| Narrower, taller sidewall | 225/50R17 (compare) | 25.9 in | +2.1% | 61.3 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 |
|---|---|---|---|
| 215/55R16 (compare) | 25.3 in | -0.1% | -20 mm |
| 265/45R16 (compare) | 25.4 in | +0.2% | +30 mm |
| 235/50R16 (compare) | 25.3 in | -0.3% | +0 mm |
| 255/45R16 (compare) | 25.0 in | -1.2% | +20 mm |
18 in wheels (one wheel size larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 265/35R18 (compare) | 25.3 in | -0.1% | +30 mm |
| 205/45R18 (compare) | 25.3 in | -0.2% | -30 mm |
| 235/40R18 (compare) | 25.4 in | +0.3% | +0 mm |
| 225/40R18 (compare) | 25.1 in | -0.9% | -10 mm |
19 in wheels (two wheel sizes larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 265/30R19 (compare) | 25.3 in | -0.3% | +30 mm |
| 225/35R19 (compare) | 25.2 in | -0.5% | -10 mm |
| 205/40R19 (compare) | 25.5 in | +0.5% | -30 mm |
| 235/35R19 (compare) | 25.5 in | +0.6% | +0 mm |
Try it with your numbers
Compare 235/45R17 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 · 225/70R17 · 235/50R17.