255/65R17 tire size
255/65R17 is a metric size: 30.1" tall, 10.0" wide, on a 17" rim — about a 30x10.00R17. The sidewall is 6.5" and the tire turns 671 times per mile.
255/65R17 specs
| Overall diameter (height) | 30.05" · 763 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 6.53" · 166 mm (65% of width) |
| Rim diameter | 17" |
| Circumference | 94.41" · 2.398 m |
| Revolutions per mile | 671 (417 per km) |
| Inch (flotation) equivalent | 30x10.00R17 |
Equivalent sizes on a 17" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 235/65R17 common | 29.03" | -3.41% | -20 mm | 58.0 mph | compare → |
| 245/70R17 common | 30.50" | +1.51% | -10 mm | 60.9 mph | compare → |
| 245/65R17 common | 29.54" | -1.70% | -10 mm | 59.0 mph | compare → |
| 245/75R17 common | 31.47" | +4.72% | -10 mm | 62.8 mph | compare → |
| 265/65R17 common | 30.56" | +1.70% | +10 mm | 61.0 mph | compare → |
| 255/70R17 common | 31.06" | +3.34% | 0 mm | 62.0 mph | compare → |
| 235/75R17 | 30.88" | +2.75% | -20 mm | 61.7 mph | compare → |
| 235/70R17 | 29.95" | -0.33% | -20 mm | 59.8 mph | compare → |
| 255/60R17 | 29.05" | -3.34% | 0 mm | 58.0 mph | compare → |
| 225/75R17 | 30.29" | +0.79% | -30 mm | 60.5 mph | compare → |
| 275/55R17 | 28.91" | -3.80% | +20 mm | 57.7 mph | compare → |
| 275/60R17 | 29.99" | -0.20% | +20 mm | 59.9 mph | calculate → |
| 265/60R17 | 29.52" | -1.77% | +10 mm | 58.9 mph | calculate → |
| 275/65R17 | 31.07" | +3.41% | +20 mm | 62.0 mph | calculate → |
| 215/70R17 | 28.85" | -4.00% | -40 mm | 57.6 mph | calculate → |
| 165/90R17 | 28.69" | -4.52% | -90 mm | 57.3 mph | calculate → |
| 315/55R17 | 30.64" | +1.97% | +60 mm | 61.2 mph | calculate → |
| 175/90R17 | 29.40" | -2.16% | -80 mm | 58.7 mph | calculate → |
| 31x10.50R17 | 31.00" | +3.16% | +12 mm | 61.9 mph | calculate → |
| 285/60R17 | 30.46" | +1.38% | +30 mm | 60.8 mph | calculate → |
| 225/70R17 | 29.40" | -2.16% | -30 mm | 58.7 mph | calculate → |
| 245/60R17 | 28.57" | -4.91% | -10 mm | 57.1 mph | calculate → |
Plus / minus sizing: 16" and 18" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 235/65R18 common | 30.03" | -0.08% | -20 mm | 60.0 mph | compare → |
| 255/70R16 common | 30.06" | +0.01% | 0 mm | 60.0 mph | compare → |
| 255/60R18 | 30.05" | -0.01% | 0 mm | 60.0 mph | compare → |
| 235/75R16 | 29.88" | -0.58% | -20 mm | 59.7 mph | compare → |
| 30x11.50R16 | 30.00" | -0.17% | +37 mm | 59.9 mph | calculate → |
| 275/55R18 | 29.91" | -0.47% | +20 mm | 59.7 mph | calculate → |
| 285/55R18 | 30.34" | +0.97% | +30 mm | 60.6 mph | calculate → |
Try another size against 255/65R17
Questions
What size is 255/65R17 in inches?
255/65R17 is about 30.1" tall and 10.0" wide on a 17-inch rim — roughly a 30x10.00R17 in inch sizing.
What does 255/65R17 mean?
255 mm section width, sidewall 65% of the width (6.53"), radial construction, 17-inch rim.
What tire sizes are equivalent to 255/65R17?
On the same 17" rim, within 3% of the diameter: 275/60R17 (-0.20%), 235/70R17 (-0.33%), 225/75R17 (+0.79%), 285/60R17 (+1.38%), 245/70R17 (+1.51%), 265/65R17 (+1.70%).
How many revolutions per mile does a 255/65R17 tire make?
About 671 revolutions per mile (circumference 94.4").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.