265/45R20 dimensions
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 29.39 in | 746 mm |
| Section width | 10.43 in | 265 mm |
| Sidewall height | 4.69 in | 119.2 mm |
| Wheel diameter | 20 in | 508 mm |
| Circumference | 92.3 in | 2,345 mm |
| Revolutions per mile | 686.2 |
The math
| Step | Math | Result |
|---|---|---|
| Sidewall | 265 × 45% = 119.2 mm ÷ 25.4 | 4.69 in |
| Overall height | 20 + 2 × 4.69 | 29.39 in |
| Width | 265 mm ÷ 25.4 | 10.43 in |
| Circumference | π × 29.39 | 92.3 in |
| Revs per mile | 63,360 ÷ 92.3 | 686.2 |
With a 4.7 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 20 in wheel
Each row changes one thing and shows the height change against 265/45R20, 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 | 275/45R20 (compare) | 29.7 in | +1.2% | 60.7 mph | Close match |
| Narrower | 255/45R20 (compare) | 29.0 in | -1.2% | 59.3 mph | Close match |
| Taller sidewall | 265/50R20 (compare) | 30.4 in | +3.5% | 62.1 mph | Check clearance |
| Shorter sidewall | 265/40R20 (compare) | 28.3 in | -3.5% | 57.9 mph | Check clearance |
| Wider, shorter sidewall | 275/40R20 (compare) | 28.7 in | -2.5% | 58.5 mph | Close match |
| Narrower, taller sidewall | 255/50R20 (compare) | 30.0 in | +2.2% | 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.
19 in wheels (one wheel size smaller)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 265/50R19 (compare) | 29.4 in | +0.1% | +0 mm |
| 295/45R19 (compare) | 29.5 in | +0.2% | +30 mm |
| 235/55R19 (compare) | 29.2 in | -0.7% | -30 mm |
| 245/55R19 (compare) | 29.6 in | +0.8% | -20 mm |
21 in wheels (one wheel size larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 265/40R21 (compare) | 29.3 in | -0.1% | +0 mm |
| 235/45R21 (compare) | 29.3 in | -0.2% | -30 mm |
| 295/35R21 (compare) | 29.1 in | -0.9% | +30 mm |
| 275/40R21 (compare) | 29.7 in | +0.9% | +10 mm |
22 in wheels (two wheel sizes larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 235/40R22 (compare) | 29.4 in | +0.0% | -30 mm |
| 265/35R22 (compare) | 29.3 in | -0.3% | +0 mm |
| 275/35R22 (compare) | 29.6 in | +0.6% | +10 mm |
| 245/40R22 (compare) | 29.7 in | +1.1% | -20 mm |
Try it with your numbers
Compare 265/45R20 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 · 255/55R20 · 265/50R20.