305/70R17 tire size
305/70R17 is a metric size: 33.8" tall, 12.0" wide, on a 17" rim — about a 34x12.00R17. The sidewall is 8.4" and the tire turns 596 times per mile.
305/70R17 specs
| Overall diameter (height) | 33.81" · 859 mm |
|---|---|
| Section width | 12.01" · 305 mm |
| Sidewall height | 8.41" · 214 mm (70% of width) |
| Rim diameter | 17" |
| Circumference | 106.22" · 2.698 m |
| Revolutions per mile | 596 (371 per km) |
| Inch (flotation) equivalent | 34x12.00R17 |
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 | |
|---|---|---|---|---|---|
| 285/70R17 common | 32.71" | -3.26% | -20 mm | 58.0 mph | compare → |
| 35x12.50R17 common | 35.00" | +3.52% | +13 mm | 62.1 mph | compare → |
| 315/70R17 common | 34.36" | +1.63% | +10 mm | 61.0 mph | compare → |
| 295/70R17 | 33.26" | -1.63% | -10 mm | 59.0 mph | compare → |
| 285/75R17 | 33.83" | +0.06% | -20 mm | 60.0 mph | compare → |
| 33x12.50R17 | 33.00" | -2.40% | +13 mm | 58.6 mph | compare → |
| 275/70R17 | 32.16" | -4.89% | -30 mm | 57.1 mph | compare → |
| 255/80R17 | 33.06" | -2.21% | -50 mm | 58.7 mph | compare → |
| 305/65R17 | 32.61" | -3.55% | 0 mm | 57.9 mph | compare → |
| 35x11.50R17 | 35.00" | +3.52% | -13 mm | 62.1 mph | calculate → |
| 34x10.50R17 | 34.00" | +0.56% | -38 mm | 60.3 mph | calculate → |
| 35x14.50R17 | 35.00" | +3.52% | +63 mm | 62.1 mph | calculate → |
| 35x13.50R17 | 35.00" | +3.52% | +38 mm | 62.1 mph | calculate → |
| 255/85R17 | 34.07" | +0.76% | -50 mm | 60.5 mph | calculate → |
| 275/80R17 | 34.32" | +1.51% | -30 mm | 60.9 mph | calculate → |
| 33x10.50R17 | 33.00" | -2.40% | -38 mm | 58.6 mph | calculate → |
| 33x11.50R17 | 33.00" | -2.40% | -13 mm | 58.6 mph | calculate → |
| 33x13.50R17 | 33.00" | -2.40% | +38 mm | 58.6 mph | calculate → |
| 33x13.00R17 | 33.00" | -2.40% | +25 mm | 58.6 mph | calculate → |
| 33x9.50R17 | 33.00" | -2.40% | -64 mm | 58.6 mph | calculate → |
| 35x10.50R17 | 35.00" | +3.52% | -38 mm | 62.1 mph | calculate → |
| 235/85R17 | 32.73" | -3.20% | -70 mm | 58.1 mph | calculate → |
| 325/70R17 | 34.91" | +3.26% | +20 mm | 62.0 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 | |
|---|---|---|---|---|---|
| 305/65R18 | 33.61" | -0.59% | 0 mm | 59.6 mph | compare → |
| 285/70R18 | 33.71" | -0.30% | -20 mm | 59.8 mph | compare → |
| 34x10.50R16 | 34.00" | +0.56% | -38 mm | 60.3 mph | calculate → |
| 34x12.50R16 | 34.00" | +0.56% | +13 mm | 60.3 mph | calculate → |
| 34x12.50R18 | 34.00" | +0.56% | +13 mm | 60.3 mph | calculate → |
| 34x13.50R16 | 34.00" | +0.56% | +38 mm | 60.3 mph | calculate → |
| 34x9.00R16 | 34.00" | +0.56% | -76 mm | 60.3 mph | calculate → |
| 33.5x16.50R16 | 33.50" | -0.92% | +114 mm | 59.4 mph | calculate → |
Try another size against 305/70R17
Questions
What size is 305/70R17 in inches?
305/70R17 is about 33.8" tall and 12.0" wide on a 17-inch rim — roughly a 34x12.00R17 in inch sizing.
What does 305/70R17 mean?
305 mm section width, sidewall 70% of the width (8.41"), radial construction, 17-inch rim.
What tire sizes are equivalent to 305/70R17?
On the same 17" rim, within 3% of the diameter: 285/75R17 (+0.06%), 34x10.50R17 (+0.56%), 255/85R17 (+0.76%), 275/80R17 (+1.51%), 295/70R17 (-1.63%), 315/70R17 (+1.63%).
How many revolutions per mile does a 305/70R17 tire make?
About 596 revolutions per mile (circumference 106.2").
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.