345/25R20 tire size
345/25R20 is a metric size: 26.8" tall, 13.6" wide, on a 20" rim — about a 27x13.50R20. The sidewall is 3.4" and the tire turns 753 times per mile.
345/25R20 specs
| Overall diameter (height) | 26.79" · 681 mm |
|---|---|
| Section width | 13.58" · 345 mm |
| Sidewall height | 3.40" · 86 mm (25% of width) |
| Rim diameter | 20" |
| Circumference | 84.17" · 2.138 m |
| Revolutions per mile | 753 (468 per km) |
| Inch (flotation) equivalent | 27x13.50R20 |
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 | |
|---|---|---|---|---|---|
| 245/40R20 common | 27.72" | +3.45% | -100 mm | 62.1 mph | calculate → |
| 245/35R20 common | 26.75" | -0.15% | -100 mm | 59.9 mph | calculate → |
| 255/35R20 common | 27.03" | +0.88% | -90 mm | 60.5 mph | calculate → |
| 275/35R20 common | 27.58" | +2.94% | -70 mm | 61.8 mph | calculate → |
| 255/40R20 common | 28.03" | +4.63% | -90 mm | 62.8 mph | calculate → |
| 285/35R20 common | 27.85" | +3.97% | -60 mm | 62.4 mph | calculate → |
| 285/30R20 common | 26.73" | -0.22% | -60 mm | 59.9 mph | calculate → |
| 275/30R20 common | 26.50" | -1.10% | -70 mm | 59.3 mph | calculate → |
| 265/35R20 common | 27.30" | +1.91% | -80 mm | 61.1 mph | calculate → |
| 235/35R20 | 26.48" | -1.18% | -110 mm | 59.3 mph | calculate → |
| 295/30R20 | 26.97" | +0.66% | -50 mm | 60.4 mph | calculate → |
| 305/30R20 | 27.20" | +1.54% | -40 mm | 60.9 mph | calculate → |
| 295/35R20 | 28.13" | +5.00% | -50 mm | 63.0 mph | calculate → |
| 245/30R20 | 25.79" | -3.75% | -100 mm | 57.8 mph | calculate → |
| 265/30R20 | 26.26" | -1.98% | -80 mm | 58.8 mph | calculate → |
| 255/30R20 | 26.02" | -2.87% | -90 mm | 58.3 mph | calculate → |
| 225/35R20 | 26.20" | -2.20% | -120 mm | 58.7 mph | calculate → |
| 335/25R20 | 26.59" | -0.73% | -10 mm | 59.6 mph | calculate → |
| 315/30R20 | 27.44" | +2.42% | -30 mm | 61.5 mph | calculate → |
| 235/30R20 | 25.55" | -4.63% | -110 mm | 57.2 mph | calculate → |
| 305/25R20 | 26.00" | -2.94% | -40 mm | 58.2 mph | calculate → |
| 235/40R20 | 27.40" | +2.28% | -110 mm | 61.4 mph | calculate → |
| 295/25R20 | 25.81" | -3.67% | -50 mm | 57.8 mph | calculate → |
| 335/30R20 | 27.91" | +4.19% | -10 mm | 62.5 mph | calculate → |
| 325/25R20 | 26.40" | -1.47% | -20 mm | 59.1 mph | calculate → |
| 325/30R20 | 27.68" | +3.31% | -20 mm | 62.0 mph | calculate → |
| 285/25R20 | 25.61" | -4.41% | -60 mm | 57.4 mph | calculate → |
| 215/45R20 | 27.62" | +3.09% | -130 mm | 61.9 mph | calculate → |
| 225/40R20 | 27.09" | +1.10% | -120 mm | 60.7 mph | calculate → |
| 195/50R20 | 27.68" | +3.31% | -150 mm | 62.0 mph | calculate → |
| 145/60R20 | 26.85" | +0.22% | -200 mm | 60.1 mph | calculate → |
| 155/60R20 | 27.32" | +1.98% | -190 mm | 61.2 mph | calculate → |
| 145/65R20 | 27.42" | +2.35% | -200 mm | 61.4 mph | calculate → |
| 175/55R20 | 27.58" | +2.94% | -170 mm | 61.8 mph | calculate → |
| 315/25R20 | 26.20" | -2.20% | -30 mm | 58.7 mph | calculate → |
| 165/60R20 | 27.80" | +3.75% | -180 mm | 62.2 mph | calculate → |
| 155/65R20 | 27.93" | +4.26% | -190 mm | 62.6 mph | calculate → |
| 225/45R20 | 27.97" | +4.41% | -120 mm | 62.6 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 | |
|---|---|---|---|---|---|
| 245/40R19 common | 26.72" | -0.28% | -100 mm | 59.8 mph | calculate → |
| 255/40R19 common | 27.03" | +0.90% | -90 mm | 60.5 mph | calculate → |
| 275/35R19 common | 26.58" | -0.79% | -70 mm | 59.5 mph | calculate → |
| 225/45R19 common | 26.97" | +0.68% | -120 mm | 60.4 mph | calculate → |
| 285/35R19 common | 26.85" | +0.24% | -60 mm | 60.1 mph | calculate → |
| 325/30R19 | 26.68" | -0.43% | -20 mm | 59.7 mph | calculate → |
| 255/30R21 | 27.02" | +0.87% | -90 mm | 60.5 mph | calculate → |
| 295/25R21 | 26.81" | +0.06% | -50 mm | 60.0 mph | calculate → |
| 305/25R21 | 27.00" | +0.79% | -40 mm | 60.5 mph | calculate → |
| 245/30R21 | 26.79" | -0.01% | -100 mm | 60.0 mph | calculate → |
| 195/50R19 | 26.68" | -0.43% | -150 mm | 59.7 mph | calculate → |
| 335/30R19 | 26.91" | +0.46% | -10 mm | 60.3 mph | calculate → |
Try another size against 345/25R20
Questions
What size is 345/25R20 in inches?
345/25R20 is about 26.8" tall and 13.6" wide on a 20-inch rim — roughly a 27x13.50R20 in inch sizing.
What does 345/25R20 mean?
345 mm section width, sidewall 25% of the width (3.40"), radial construction, 20-inch rim.
What tire sizes are equivalent to 345/25R20?
On the same 20" rim, within 3% of the diameter: 245/35R20 (-0.15%), 145/60R20 (+0.22%), 285/30R20 (-0.22%), 295/30R20 (+0.66%), 335/25R20 (-0.73%), 255/35R20 (+0.88%).
How many revolutions per mile does a 345/25R20 tire make?
About 753 revolutions per mile (circumference 84.2").
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.