345/40R17 tire size
345/40R17 is a metric size: 27.9" tall, 13.6" wide, on a 17" rim — about a 28x13.50R17. The sidewall is 5.4" and the tire turns 724 times per mile.
345/40R17 specs
| Overall diameter (height) | 27.87" · 708 mm |
|---|---|
| Section width | 13.58" · 345 mm |
| Sidewall height | 5.43" · 138 mm (40% of width) |
| Rim diameter | 17" |
| Circumference | 87.54" · 2.224 m |
| Revolutions per mile | 724 (450 per km) |
| Inch (flotation) equivalent | 28x13.50R17 |
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 | |
|---|---|---|---|---|---|
| 225/55R17 common | 26.74" | -4.03% | -120 mm | 57.6 mph | calculate → |
| 225/65R17 common | 28.52" | +2.33% | -120 mm | 61.4 mph | calculate → |
| 235/65R17 common | 29.03" | +4.17% | -110 mm | 62.5 mph | calculate → |
| 235/55R17 common | 27.18" | -2.47% | -110 mm | 58.5 mph | calculate → |
| 225/60R17 common | 27.63" | -0.85% | -120 mm | 59.5 mph | calculate → |
| 235/60R17 common | 28.10" | +0.85% | -110 mm | 60.5 mph | calculate → |
| 215/65R17 common | 28.00" | +0.49% | -130 mm | 60.3 mph | calculate → |
| 215/60R17 common | 27.16" | -2.54% | -130 mm | 58.5 mph | calculate → |
| 245/50R17 | 26.65" | -4.38% | -100 mm | 57.4 mph | calculate → |
| 255/60R17 | 29.05" | +4.24% | -90 mm | 62.5 mph | calculate → |
| 275/55R17 | 28.91" | +3.74% | -70 mm | 62.2 mph | calculate → |
| 245/55R17 | 27.61" | -0.92% | -100 mm | 59.4 mph | calculate → |
| 165/90R17 | 28.69" | +2.97% | -180 mm | 61.8 mph | calculate → |
| 215/70R17 | 28.85" | +3.53% | -130 mm | 62.1 mph | calculate → |
| 305/45R17 | 27.81" | -0.21% | -40 mm | 59.9 mph | calculate → |
| 155/90R17 | 27.98" | +0.42% | -190 mm | 60.3 mph | calculate → |
| 255/55R17 | 28.04" | +0.64% | -90 mm | 60.4 mph | calculate → |
| 165/80R17 | 27.39" | -1.70% | -180 mm | 59.0 mph | calculate → |
| 255/50R17 | 27.04" | -2.97% | -90 mm | 58.2 mph | calculate → |
| 155/80R17 | 26.76" | -3.96% | -190 mm | 57.6 mph | calculate → |
| 275/50R17 | 27.83" | -0.14% | -70 mm | 59.9 mph | calculate → |
| 28x6.00R17 | 28.00" | +0.48% | -193 mm | 60.3 mph | calculate → |
| 145/90R17 | 27.28" | -2.12% | -200 mm | 58.7 mph | calculate → |
| 205/65R17 | 27.49" | -1.34% | -140 mm | 59.2 mph | calculate → |
| 245/60R17 | 28.57" | +2.54% | -100 mm | 61.5 mph | calculate → |
| 205/60R17 | 26.69" | -4.24% | -140 mm | 57.5 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" | -0.44% | -120 mm | 59.7 mph | calculate → |
| 215/70R16 common | 27.85" | -0.06% | -130 mm | 60.0 mph | calculate → |
| 245/50R18 common | 27.65" | -0.79% | -100 mm | 59.5 mph | calculate → |
| 235/65R16 common | 28.03" | +0.58% | -110 mm | 60.3 mph | calculate → |
| 275/45R18 | 27.74" | -0.44% | -70 mm | 59.7 mph | calculate → |
| 205/75R16 | 28.11" | +0.86% | -140 mm | 60.5 mph | calculate → |
| 255/50R18 | 28.04" | +0.62% | -90 mm | 60.4 mph | calculate → |
| 315/40R18 | 27.92" | +0.20% | -30 mm | 60.1 mph | calculate → |
| 305/40R18 | 27.61" | -0.93% | -40 mm | 59.4 mph | calculate → |
| 28x12.00R18 | 28.00" | +0.48% | -40 mm | 60.3 mph | calculate → |
| 145/85R18 | 27.70" | -0.58% | -200 mm | 59.7 mph | calculate → |
| 285/45R18 | 28.10" | +0.83% | -60 mm | 60.5 mph | calculate → |
| 28x10.00R18 | 28.00" | +0.48% | -91 mm | 60.3 mph | calculate → |
| 28x11.50R16 | 28.00" | +0.48% | -53 mm | 60.3 mph | calculate → |
| 255/60R16 | 28.05" | +0.65% | -90 mm | 60.4 mph | calculate → |
| 205/60R18 | 27.69" | -0.65% | -140 mm | 59.6 mph | calculate → |
| 295/50R16 | 27.61" | -0.90% | -50 mm | 59.5 mph | calculate → |
Try another size against 345/40R17
Questions
What size is 345/40R17 in inches?
345/40R17 is about 27.9" tall and 13.6" wide on a 17-inch rim — roughly a 28x13.50R17 in inch sizing.
What does 345/40R17 mean?
345 mm section width, sidewall 40% of the width (5.43"), radial construction, 17-inch rim.
What tire sizes are equivalent to 345/40R17?
On the same 17" rim, within 3% of the diameter: 275/50R17 (-0.14%), 305/45R17 (-0.21%), 155/90R17 (+0.42%), 28x6.00R17 (+0.48%), 215/65R17 (+0.49%), 255/55R17 (+0.64%).
How many revolutions per mile does a 345/40R17 tire make?
About 724 revolutions per mile (circumference 87.5").
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.