315/55R17 tire size
315/55R17 is a metric size: 30.6" tall, 12.4" wide, on a 17" rim — about a 30.5x12.50R17. The sidewall is 6.8" and the tire turns 658 times per mile.
315/55R17 specs
| Overall diameter (height) | 30.64" · 778 mm |
|---|---|
| Section width | 12.40" · 315 mm |
| Sidewall height | 6.82" · 173 mm (55% of width) |
| Rim diameter | 17" |
| Circumference | 96.26" · 2.445 m |
| Revolutions per mile | 658 (409 per km) |
| Inch (flotation) equivalent | 30.5x12.50R17 |
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 | |
|---|---|---|---|---|---|
| 265/70R17 common | 31.61" | +3.15% | -50 mm | 61.9 mph | calculate → |
| 245/70R17 common | 30.50" | -0.45% | -70 mm | 59.7 mph | calculate → |
| 245/65R17 common | 29.54" | -3.60% | -70 mm | 57.8 mph | calculate → |
| 245/75R17 common | 31.47" | +2.70% | -70 mm | 61.6 mph | calculate → |
| 265/65R17 common | 30.56" | -0.26% | -50 mm | 59.8 mph | calculate → |
| 235/80R17 common | 31.80" | +3.79% | -80 mm | 62.3 mph | calculate → |
| 255/65R17 common | 30.05" | -1.93% | -60 mm | 58.8 mph | calculate → |
| 255/70R17 common | 31.06" | +1.35% | -60 mm | 60.8 mph | calculate → |
| 255/75R17 | 32.06" | +4.63% | -60 mm | 62.8 mph | calculate → |
| 235/75R17 | 30.88" | +0.77% | -80 mm | 60.5 mph | calculate → |
| 275/70R17 | 32.16" | +4.95% | -40 mm | 63.0 mph | calculate → |
| 235/70R17 | 29.95" | -2.25% | -80 mm | 58.7 mph | calculate → |
| 225/75R17 | 30.29" | -1.16% | -90 mm | 59.3 mph | calculate → |
| 275/60R17 | 29.99" | -2.12% | -40 mm | 58.7 mph | calculate → |
| 275/65R17 | 31.07" | +1.41% | -40 mm | 60.8 mph | calculate → |
| 265/60R17 | 29.52" | -3.66% | -50 mm | 57.8 mph | calculate → |
| 285/65R17 | 31.59" | +3.08% | -30 mm | 61.9 mph | calculate → |
| 31x10.50R17 | 31.00" | +1.17% | -48 mm | 60.7 mph | calculate → |
| 315/60R17 | 31.88" | +4.05% | 0 mm | 62.4 mph | calculate → |
| 175/90R17 | 29.40" | -4.05% | -140 mm | 57.6 mph | calculate → |
| 32x11.50R17 | 32.00" | +4.43% | -23 mm | 62.7 mph | calculate → |
| 285/60R17 | 30.46" | -0.58% | -30 mm | 59.7 mph | calculate → |
| 225/70R17 | 29.40" | -4.05% | -90 mm | 57.6 mph | calculate → |
| 32x10.50R17 | 32.00" | +4.43% | -48 mm | 62.7 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" | -0.40% | -50 mm | 59.8 mph | calculate → |
| 245/75R16 common | 30.47" | -0.57% | -70 mm | 59.7 mph | calculate → |
| 265/70R16 common | 30.61" | -0.12% | -50 mm | 59.9 mph | calculate → |
| 215/85R16 common | 30.39" | -0.82% | -100 mm | 59.5 mph | calculate → |
| 235/80R16 | 30.80" | +0.53% | -80 mm | 60.3 mph | calculate → |
| 285/65R16 | 30.59" | -0.18% | -30 mm | 59.9 mph | calculate → |
| 245/65R18 | 30.54" | -0.33% | -70 mm | 59.8 mph | calculate → |
| 175/90R18 | 30.40" | -0.78% | -140 mm | 59.5 mph | calculate → |
| 285/55R18 | 30.34" | -0.98% | -30 mm | 59.4 mph | calculate → |
Try another size against 315/55R17
Questions
What size is 315/55R17 in inches?
315/55R17 is about 30.6" tall and 12.4" wide on a 17-inch rim — roughly a 30.5x12.50R17 in inch sizing.
What does 315/55R17 mean?
315 mm section width, sidewall 55% of the width (6.82"), radial construction, 17-inch rim.
What tire sizes are equivalent to 315/55R17?
On the same 17" rim, within 3% of the diameter: 265/65R17 (-0.26%), 245/70R17 (-0.45%), 285/60R17 (-0.58%), 235/75R17 (+0.77%), 225/75R17 (-1.16%), 31x10.50R17 (+1.17%).
How many revolutions per mile does a 315/55R17 tire make?
About 658 revolutions per mile (circumference 96.3").
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.