245/70R17 tire size
245/70R17 is a metric size: 30.5" tall, 9.6" wide, on a 17" rim — about a 30.5x9.50R17. The sidewall is 6.8" and the tire turns 661 times per mile.
245/70R17 specs
| Overall diameter (height) | 30.50" · 775 mm |
|---|---|
| Section width | 9.65" · 245 mm |
| Sidewall height | 6.75" · 172 mm (70% of width) |
| Rim diameter | 17" |
| Circumference | 95.83" · 2.434 m |
| Revolutions per mile | 661 (411 per km) |
| Inch (flotation) equivalent | 30.5x9.50R17 |
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 | |
|---|---|---|---|---|---|
| 265/70R17 common | 31.61" | +3.61% | +20 mm | 62.2 mph | compare → |
| 235/65R17 common | 29.03" | -4.84% | -10 mm | 57.1 mph | compare → |
| 245/65R17 common | 29.54" | -3.16% | 0 mm | 58.1 mph | compare → |
| 245/75R17 common | 31.47" | +3.16% | 0 mm | 61.9 mph | compare → |
| 265/65R17 common | 30.56" | +0.19% | +20 mm | 60.1 mph | compare → |
| 235/80R17 common | 31.80" | +4.26% | -10 mm | 62.6 mph | compare → |
| 255/65R17 common | 30.05" | -1.48% | +10 mm | 59.1 mph | compare → |
| 255/70R17 common | 31.06" | +1.81% | +10 mm | 61.1 mph | compare → |
| 235/75R17 | 30.88" | +1.23% | -10 mm | 60.7 mph | compare → |
| 235/70R17 | 29.95" | -1.81% | -10 mm | 58.9 mph | compare → |
| 255/60R17 | 29.05" | -4.78% | +10 mm | 57.1 mph | compare → |
| 225/75R17 | 30.29" | -0.71% | -20 mm | 59.6 mph | compare → |
| 275/60R17 | 29.99" | -1.68% | +30 mm | 59.0 mph | calculate → |
| 275/65R17 | 31.07" | +1.87% | +30 mm | 61.1 mph | calculate → |
| 265/60R17 | 29.52" | -3.23% | +20 mm | 58.1 mph | calculate → |
| 285/65R17 | 31.59" | +3.55% | +40 mm | 62.1 mph | calculate → |
| 315/55R17 | 30.64" | +0.45% | +70 mm | 60.3 mph | calculate → |
| 31x10.50R17 | 31.00" | +1.63% | +22 mm | 61.0 mph | calculate → |
| 175/90R17 | 29.40" | -3.61% | -70 mm | 57.8 mph | calculate → |
| 315/60R17 | 31.88" | +4.52% | +70 mm | 62.7 mph | calculate → |
| 32x11.50R17 | 32.00" | +4.90% | +47 mm | 62.9 mph | calculate → |
| 285/60R17 | 30.46" | -0.13% | +40 mm | 59.9 mph | calculate → |
| 225/70R17 | 29.40" | -3.61% | -20 mm | 57.8 mph | calculate → |
| 32x10.50R17 | 32.00" | +4.90% | +22 mm | 62.9 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 | |
|---|---|---|---|---|---|
| 265/60R18 common | 30.52" | +0.05% | +20 mm | 60.0 mph | compare → |
| 245/75R16 common | 30.47" | -0.12% | 0 mm | 59.9 mph | compare → |
| 265/70R16 common | 30.61" | +0.34% | +20 mm | 60.2 mph | compare → |
| 215/85R16 common | 30.39" | -0.37% | -30 mm | 59.8 mph | compare → |
| 235/80R16 | 30.80" | +0.98% | -10 mm | 60.6 mph | calculate → |
| 285/65R16 | 30.59" | +0.27% | +40 mm | 60.2 mph | calculate → |
| 245/65R18 | 30.54" | +0.12% | 0 mm | 60.1 mph | calculate → |
| 175/90R18 | 30.40" | -0.34% | -70 mm | 59.8 mph | calculate → |
| 285/55R18 | 30.34" | -0.53% | +40 mm | 59.7 mph | calculate → |
Try another size against 245/70R17
Questions
What size is 245/70R17 in inches?
245/70R17 is about 30.5" tall and 9.6" wide on a 17-inch rim — roughly a 30.5x9.50R17 in inch sizing.
What does 245/70R17 mean?
245 mm section width, sidewall 70% of the width (6.75"), radial construction, 17-inch rim.
What tire sizes are equivalent to 245/70R17?
On the same 17" rim, within 3% of the diameter: 285/60R17 (-0.13%), 265/65R17 (+0.19%), 315/55R17 (+0.45%), 225/75R17 (-0.71%), 235/75R17 (+1.23%), 255/65R17 (-1.48%).
How many revolutions per mile does a 245/70R17 tire make?
About 661 revolutions per mile (circumference 95.8").
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.