345/30R20 tire size
345/30R20 is a metric size: 28.1" tall, 13.6" wide, on a 20" rim — about a 28x13.50R20. The sidewall is 4.1" and the tire turns 716 times per mile.
345/30R20 specs
| Overall diameter (height) | 28.15" · 715 mm |
|---|---|
| Section width | 13.58" · 345 mm |
| Sidewall height | 4.07" · 103 mm (30% of width) |
| Rim diameter | 20" |
| Circumference | 88.43" · 2.246 m |
| Revolutions per mile | 716 (445 per km) |
| Inch (flotation) equivalent | 28x13.50R20 |
Equivalent sizes on a 20" 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 | |
|---|---|---|---|---|---|
| 245/45R20 common | 28.68" | +1.89% | -100 mm | 61.1 mph | calculate → |
| 255/45R20 common | 29.04" | +3.15% | -90 mm | 61.9 mph | calculate → |
| 275/40R20 common | 28.66" | +1.82% | -70 mm | 61.1 mph | calculate → |
| 245/40R20 common | 27.72" | -1.54% | -100 mm | 59.1 mph | calculate → |
| 245/35R20 common | 26.75" | -4.97% | -100 mm | 57.0 mph | calculate → |
| 255/35R20 common | 27.03" | -3.99% | -90 mm | 57.6 mph | calculate → |
| 255/40R20 common | 28.03" | -0.42% | -90 mm | 59.7 mph | calculate → |
| 275/35R20 common | 27.58" | -2.03% | -70 mm | 58.8 mph | calculate → |
| 265/45R20 common | 29.39" | +4.41% | -80 mm | 62.6 mph | calculate → |
| 285/35R20 common | 27.85" | -1.05% | -60 mm | 59.4 mph | calculate → |
| 315/35R20 common | 28.68" | +1.89% | -30 mm | 61.1 mph | calculate → |
| 265/35R20 common | 27.30" | -3.01% | -80 mm | 58.2 mph | calculate → |
| 295/30R20 | 26.97" | -4.20% | -50 mm | 57.5 mph | calculate → |
| 305/30R20 | 27.20" | -3.36% | -40 mm | 58.0 mph | calculate → |
| 295/40R20 | 29.29" | +4.06% | -50 mm | 62.4 mph | calculate → |
| 295/35R20 | 28.13" | -0.07% | -50 mm | 60.0 mph | calculate → |
| 305/35R20 | 28.41" | +0.91% | -40 mm | 60.5 mph | calculate → |
| 285/40R20 | 28.98" | +2.94% | -60 mm | 61.8 mph | calculate → |
| 235/50R20 | 29.25" | +3.92% | -110 mm | 62.3 mph | calculate → |
| 235/45R20 | 28.33" | +0.63% | -110 mm | 60.4 mph | calculate → |
| 265/40R20 | 28.35" | +0.70% | -80 mm | 60.4 mph | calculate → |
| 315/30R20 | 27.44" | -2.52% | -30 mm | 58.5 mph | calculate → |
| 235/40R20 | 27.40" | -2.66% | -110 mm | 58.4 mph | calculate → |
| 335/30R20 | 27.91" | -0.84% | -10 mm | 59.5 mph | calculate → |
| 325/30R20 | 27.68" | -1.68% | -20 mm | 59.0 mph | calculate → |
| 215/45R20 | 27.62" | -1.89% | -130 mm | 58.9 mph | calculate → |
| 345/25R20 | 26.79" | -4.83% | 0 mm | 57.1 mph | calculate → |
| 195/50R20 | 27.68" | -1.68% | -150 mm | 59.0 mph | calculate → |
| 325/35R20 | 28.96" | +2.87% | -20 mm | 61.7 mph | calculate → |
| 225/40R20 | 27.09" | -3.78% | -120 mm | 57.7 mph | calculate → |
| 175/55R20 | 27.58" | -2.03% | -170 mm | 58.8 mph | calculate → |
| 145/65R20 | 27.42" | -2.59% | -200 mm | 58.4 mph | calculate → |
| 155/60R20 | 27.32" | -2.94% | -190 mm | 58.2 mph | calculate → |
| 29x15.00R20 | 29.00" | +3.02% | +36 mm | 61.8 mph | calculate → |
| 29x18.00R20 | 29.00" | +3.02% | +112 mm | 61.8 mph | calculate → |
| 145/60R20 | 26.85" | -4.62% | -200 mm | 57.2 mph | calculate → |
| 225/45R20 | 27.97" | -0.63% | -120 mm | 59.6 mph | calculate → |
| 155/65R20 | 27.93" | -0.77% | -190 mm | 59.5 mph | calculate → |
| 195/55R20 | 28.44" | +1.05% | -150 mm | 60.6 mph | calculate → |
| 165/60R20 | 27.80" | -1.26% | -180 mm | 59.2 mph | calculate → |
Plus / minus sizing: 19" and 21" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 255/45R19 common | 28.04" | -0.41% | -90 mm | 59.8 mph | calculate → |
| 235/50R19 common | 28.25" | +0.36% | -110 mm | 60.2 mph | calculate → |
| 265/35R21 | 28.30" | +0.55% | -80 mm | 60.3 mph | calculate → |
| 285/40R19 | 27.98" | -0.62% | -60 mm | 59.6 mph | calculate → |
| 255/35R21 | 28.03" | -0.43% | -90 mm | 59.7 mph | calculate → |
| 305/30R21 | 28.20" | +0.20% | -40 mm | 60.1 mph | calculate → |
| 295/30R21 | 27.97" | -0.64% | -50 mm | 59.6 mph | calculate → |
| 295/40R19 | 28.29" | +0.50% | -50 mm | 60.3 mph | calculate → |
| 355/25R21 | 27.99" | -0.57% | +10 mm | 59.7 mph | calculate → |
| 265/45R19 | 28.39" | +0.85% | -80 mm | 60.5 mph | calculate → |
| 145/80R19 | 28.13" | -0.06% | -200 mm | 60.0 mph | calculate → |
Try another size against 345/30R20
Questions
What size is 345/30R20 in inches?
345/30R20 is about 28.1" tall and 13.6" wide on a 20-inch rim — roughly a 28x13.50R20 in inch sizing.
What does 345/30R20 mean?
345 mm section width, sidewall 30% of the width (4.07"), radial construction, 20-inch rim.
What tire sizes are equivalent to 345/30R20?
On the same 20" rim, within 3% of the diameter: 295/35R20 (-0.07%), 255/40R20 (-0.42%), 235/45R20 (+0.63%), 225/45R20 (-0.63%), 265/40R20 (+0.70%), 155/65R20 (-0.77%).
How many revolutions per mile does a 345/30R20 tire make?
About 716 revolutions per mile (circumference 88.4").
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.