185/65R15 dimensions
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 24.47 in | 622 mm |
| Section width | 7.28 in | 185 mm |
| Sidewall height | 4.73 in | 120.2 mm |
| Wheel diameter | 15 in | 381 mm |
| Circumference | 76.9 in | 1,952 mm |
| Revolutions per mile | 824.2 |
The math
| Step | Math | Result |
|---|---|---|
| Sidewall | 185 × 65% = 120.2 mm ÷ 25.4 | 4.73 in |
| Overall height | 15 + 2 × 4.73 | 24.47 in |
| Width | 185 mm ÷ 25.4 | 7.28 in |
| Circumference | π × 24.47 | 76.9 in |
| Revs per mile | 63,360 ÷ 76.9 | 824.2 |
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 15 in wheel
Each row changes one thing and shows the height change against 185/65R15, 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 | 195/65R15 (compare) | 25.0 in | +2.1% | 61.3 mph | Close match |
| Narrower | 175/65R15 (compare) | 24.0 in | -2.1% | 58.7 mph | Close match |
| Taller sidewall | 185/70R15 (compare) | 25.2 in | +3.0% | 61.8 mph | Close match |
| Shorter sidewall | 185/60R15 (compare) | 23.7 in | -3.0% | 58.2 mph | Close match |
| Wider, shorter sidewall | 195/60R15 (compare) | 24.2 in | -1.0% | 59.4 mph | Close match |
| Narrower, taller sidewall | 175/70R15 (compare) | 24.6 in | +0.7% | 60.4 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.
14 in wheels (one wheel size smaller)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 205/65R14 (compare) | 24.5 in | +0.1% | +20 mm |
| 165/80R14 (compare) | 24.4 in | -0.3% | -20 mm |
| 155/85R14 (compare) | 24.4 in | -0.4% | -30 mm |
| 175/75R14 (compare) | 24.3 in | -0.5% | -10 mm |
16 in wheels (one wheel size larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 215/50R16 (compare) | 24.5 in | -0.0% | +30 mm |
| 165/65R16 (compare) | 24.4 in | -0.1% | -20 mm |
| 195/55R16 (compare) | 24.4 in | -0.1% | +10 mm |
| 155/70R16 (compare) | 24.5 in | +0.3% | -30 mm |
17 in wheels (two wheel sizes larger)
| Size | Height | Height change | Width change |
|---|---|---|---|
| 175/55R17 (compare) | 24.6 in | +0.5% | -10 mm |
| 155/60R17 (compare) | 24.3 in | -0.6% | -30 mm |
| 215/45R17 (compare) | 24.6 in | +0.6% | +30 mm |
| 185/50R17 (compare) | 24.3 in | -0.8% | +0 mm |
Try it with your numbers
Compare 185/65R15 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 · 185/60R15 · 195/50R15.