315/70R17 tire size
315/70R17 is a metric size: 34.4" tall, 12.4" wide, on a 17" rim — about a 34.5x12.50R17. The sidewall is 8.7" and the tire turns 587 times per mile.
315/70R17 specs
| Overall diameter (height) | 34.36" · 873 mm |
|---|---|
| Section width | 12.40" · 315 mm |
| Sidewall height | 8.68" · 220 mm (70% of width) |
| Rim diameter | 17" |
| Circumference | 107.95" · 2.742 m |
| Revolutions per mile | 587 (365 per km) |
| Inch (flotation) equivalent | 34.5x12.50R17 |
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 | |
|---|---|---|---|---|---|
| 285/70R17 common | 32.71" | -4.81% | -30 mm | 57.1 mph | compare → |
| 35x12.50R17 common | 35.00" | +1.86% | +3 mm | 61.1 mph | compare → |
| 295/70R17 | 33.26" | -3.21% | -20 mm | 58.1 mph | compare → |
| 285/75R17 | 33.83" | -1.55% | -30 mm | 59.1 mph | compare → |
| 33x12.50R17 | 33.00" | -3.96% | +3 mm | 57.6 mph | compare → |
| 255/80R17 | 33.06" | -3.78% | -60 mm | 57.7 mph | compare → |
| 305/70R17 | 33.81" | -1.60% | -10 mm | 59.0 mph | compare → |
| 35x11.50R17 | 35.00" | +1.86% | -23 mm | 61.1 mph | calculate → |
| 34x10.50R17 | 34.00" | -1.05% | -48 mm | 59.4 mph | calculate → |
| 35x14.50R17 | 35.00" | +1.86% | +53 mm | 61.1 mph | calculate → |
| 35x13.50R17 | 35.00" | +1.86% | +28 mm | 61.1 mph | calculate → |
| 36x13.50R17 | 36.00" | +4.77% | +28 mm | 62.9 mph | calculate → |
| 275/80R17 | 34.32" | -0.11% | -40 mm | 59.9 mph | calculate → |
| 255/85R17 | 34.07" | -0.86% | -60 mm | 59.5 mph | calculate → |
| 35x10.50R17 | 35.00" | +1.86% | -48 mm | 61.1 mph | calculate → |
| 33x10.50R17 | 33.00" | -3.96% | -48 mm | 57.6 mph | calculate → |
| 33x11.50R17 | 33.00" | -3.96% | -23 mm | 57.6 mph | calculate → |
| 33x13.50R17 | 33.00" | -3.96% | +28 mm | 57.6 mph | calculate → |
| 33x13.00R17 | 33.00" | -3.96% | +15 mm | 57.6 mph | calculate → |
| 33x9.50R17 | 33.00" | -3.96% | -74 mm | 57.6 mph | calculate → |
| 36x12.50R17 | 36.00" | +4.77% | +3 mm | 62.9 mph | calculate → |
| 325/70R17 | 34.91" | +1.60% | +10 mm | 61.0 mph | calculate → |
| 235/85R17 | 32.73" | -4.75% | -80 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 | |
|---|---|---|---|---|---|
| 295/70R18 common | 34.26" | -0.30% | -20 mm | 59.8 mph | compare → |
| 315/75R16 | 34.60" | +0.70% | 0 mm | 60.4 mph | compare → |
| 325/65R18 | 34.63" | +0.79% | +10 mm | 60.5 mph | compare → |
| 34.5x17.00R16 | 34.50" | +0.40% | +117 mm | 60.2 mph | calculate → |
Try another size against 315/70R17
Questions
What size is 315/70R17 in inches?
315/70R17 is about 34.4" tall and 12.4" wide on a 17-inch rim — roughly a 34.5x12.50R17 in inch sizing.
What does 315/70R17 mean?
315 mm section width, sidewall 70% of the width (8.68"), radial construction, 17-inch rim.
What tire sizes are equivalent to 315/70R17?
On the same 17" rim, within 3% of the diameter: 275/80R17 (-0.11%), 255/85R17 (-0.86%), 34x10.50R17 (-1.05%), 285/75R17 (-1.55%), 305/70R17 (-1.60%), 325/70R17 (+1.60%).
How many revolutions per mile does a 315/70R17 tire make?
About 587 revolutions per mile (circumference 108.0").
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.