305/45R17 tire size
305/45R17 is a metric size: 27.8" tall, 12.0" wide, on a 17" rim — about a 28x12.00R17. The sidewall is 5.4" and the tire turns 725 times per mile.
305/45R17 specs
| Overall diameter (height) | 27.81" · 706 mm |
|---|---|
| Section width | 12.01" · 305 mm |
| Sidewall height | 5.40" · 137 mm (45% of width) |
| Rim diameter | 17" |
| Circumference | 87.36" · 2.219 m |
| Revolutions per mile | 725 (451 per km) |
| Inch (flotation) equivalent | 28x12.00R17 |
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 | |
|---|---|---|---|---|---|
| 225/55R17 common | 26.74" | -3.82% | -80 mm | 57.7 mph | calculate → |
| 225/65R17 common | 28.52" | +2.55% | -80 mm | 61.5 mph | calculate → |
| 235/65R17 common | 29.03" | +4.39% | -70 mm | 62.6 mph | calculate → |
| 235/55R17 common | 27.18" | -2.27% | -70 mm | 58.6 mph | calculate → |
| 225/60R17 common | 27.63" | -0.64% | -80 mm | 59.6 mph | calculate → |
| 235/60R17 common | 28.10" | +1.06% | -70 mm | 60.6 mph | calculate → |
| 215/65R17 common | 28.00" | +0.71% | -90 mm | 60.4 mph | calculate → |
| 215/60R17 common | 27.16" | -2.34% | -90 mm | 58.6 mph | calculate → |
| 245/50R17 | 26.65" | -4.18% | -60 mm | 57.5 mph | calculate → |
| 255/60R17 | 29.05" | +4.46% | -50 mm | 62.7 mph | calculate → |
| 275/55R17 | 28.91" | +3.96% | -30 mm | 62.4 mph | calculate → |
| 245/55R17 | 27.61" | -0.71% | -60 mm | 59.6 mph | calculate → |
| 165/90R17 | 28.69" | +3.19% | -140 mm | 61.9 mph | calculate → |
| 215/70R17 | 28.85" | +3.75% | -90 mm | 62.3 mph | calculate → |
| 155/90R17 | 27.98" | +0.64% | -150 mm | 60.4 mph | calculate → |
| 255/55R17 | 28.04" | +0.85% | -50 mm | 60.5 mph | calculate → |
| 165/80R17 | 27.39" | -1.49% | -140 mm | 59.1 mph | calculate → |
| 255/50R17 | 27.04" | -2.76% | -50 mm | 58.3 mph | calculate → |
| 155/80R17 | 26.76" | -3.75% | -150 mm | 57.7 mph | calculate → |
| 275/50R17 | 27.83" | +0.07% | -30 mm | 60.0 mph | calculate → |
| 28x6.00R17 | 28.00" | +0.69% | -153 mm | 60.4 mph | calculate → |
| 145/90R17 | 27.28" | -1.91% | -160 mm | 58.9 mph | calculate → |
| 345/40R17 | 27.87" | +0.21% | +40 mm | 60.1 mph | calculate → |
| 205/65R17 | 27.49" | -1.13% | -100 mm | 59.3 mph | calculate → |
| 245/60R17 | 28.57" | +2.76% | -60 mm | 61.7 mph | calculate → |
| 205/60R17 | 26.69" | -4.04% | -100 mm | 57.6 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 | |
|---|---|---|---|---|---|
| 225/55R18 common | 27.74" | -0.23% | -80 mm | 59.9 mph | calculate → |
| 215/70R16 common | 27.85" | +0.16% | -90 mm | 60.1 mph | calculate → |
| 245/50R18 common | 27.65" | -0.58% | -60 mm | 59.7 mph | calculate → |
| 235/65R16 common | 28.03" | +0.79% | -70 mm | 60.5 mph | calculate → |
| 275/45R18 | 27.74" | -0.23% | -30 mm | 59.9 mph | calculate → |
| 255/50R18 | 28.04" | +0.84% | -50 mm | 60.5 mph | calculate → |
| 315/40R18 | 27.92" | +0.41% | +10 mm | 60.2 mph | calculate → |
| 305/40R18 | 27.61" | -0.72% | 0 mm | 59.6 mph | calculate → |
| 145/85R18 | 27.70" | -0.37% | -160 mm | 59.8 mph | calculate → |
| 28x12.00R18 | 28.00" | +0.69% | 0 mm | 60.4 mph | calculate → |
| 205/60R18 | 27.69" | -0.44% | -100 mm | 59.7 mph | calculate → |
| 28x10.00R18 | 28.00" | +0.69% | -51 mm | 60.4 mph | calculate → |
| 28x11.50R16 | 28.00" | +0.69% | -13 mm | 60.4 mph | calculate → |
| 295/50R16 | 27.61" | -0.69% | -10 mm | 59.6 mph | calculate → |
| 255/60R16 | 28.05" | +0.86% | -50 mm | 60.5 mph | calculate → |
Try another size against 305/45R17
Questions
What size is 305/45R17 in inches?
305/45R17 is about 27.8" tall and 12.0" wide on a 17-inch rim — roughly a 28x12.00R17 in inch sizing.
What does 305/45R17 mean?
305 mm section width, sidewall 45% of the width (5.40"), radial construction, 17-inch rim.
What tire sizes are equivalent to 305/45R17?
On the same 17" rim, within 3% of the diameter: 275/50R17 (+0.07%), 345/40R17 (+0.21%), 155/90R17 (+0.64%), 225/60R17 (-0.64%), 28x6.00R17 (+0.69%), 215/65R17 (+0.71%).
How many revolutions per mile does a 305/45R17 tire make?
About 725 revolutions per mile (circumference 87.4").
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.