265/45R20 tire size
265/45R20 is a metric size: 29.4" tall, 10.4" wide, on a 20" rim — about a 29.5x10.50R20. The sidewall is 4.7" and the tire turns 686 times per mile.
265/45R20 specs
| Overall diameter (height) | 29.39" · 747 mm |
|---|---|
| Section width | 10.43" · 265 mm |
| Sidewall height | 4.69" · 119 mm (45% of width) |
| Rim diameter | 20" |
| Circumference | 92.33" · 2.345 m |
| Revolutions per mile | 686 (426 per km) |
| Inch (flotation) equivalent | 29.5x10.50R20 |
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" | -2.41% | -20 mm | 58.6 mph | compare → |
| 255/45R20 common | 29.04" | -1.21% | -10 mm | 59.3 mph | compare → |
| 255/50R20 common | 30.04" | +2.21% | -10 mm | 61.3 mph | compare → |
| 275/40R20 common | 28.66" | -2.48% | +10 mm | 58.5 mph | compare → |
| 265/50R20 common | 30.43" | +3.55% | 0 mm | 62.1 mph | compare → |
| 245/50R20 common | 29.65" | +0.87% | -20 mm | 60.5 mph | compare → |
| 275/45R20 common | 29.74" | +1.21% | +10 mm | 60.7 mph | compare → |
| 235/55R20 common | 30.18" | +2.68% | -30 mm | 61.6 mph | compare → |
| 255/40R20 common | 28.03" | -4.62% | -10 mm | 57.2 mph | compare → |
| 315/35R20 common | 28.68" | -2.41% | +50 mm | 58.6 mph | compare → |
| 275/50R20 common | 30.83" | +4.89% | +10 mm | 62.9 mph | compare → |
| 295/40R20 | 29.29" | -0.33% | +30 mm | 59.8 mph | compare → |
| 295/35R20 | 28.13" | -4.29% | +30 mm | 57.4 mph | compare → |
| 305/35R20 | 28.41" | -3.35% | +40 mm | 58.0 mph | compare → |
| 285/40R20 | 28.98" | -1.41% | +20 mm | 59.2 mph | compare → |
| 235/50R20 | 29.25" | -0.47% | -30 mm | 59.7 mph | compare → |
| 285/45R20 | 30.10" | +2.41% | +20 mm | 61.4 mph | compare → |
| 235/45R20 | 28.33" | -3.62% | -30 mm | 57.8 mph | compare → |
| 295/45R20 | 30.45" | +3.62% | +30 mm | 62.2 mph | compare → |
| 265/40R20 | 28.35" | -3.55% | 0 mm | 57.9 mph | compare → |
| 305/40R20 | 29.61" | +0.74% | +40 mm | 60.4 mph | compare → |
| 345/30R20 | 28.15" | -4.22% | +80 mm | 57.5 mph | calculate → |
| 325/35R20 | 28.96" | -1.47% | +60 mm | 59.1 mph | calculate → |
| 29x15.00R20 | 29.00" | -1.33% | +116 mm | 59.2 mph | calculate → |
| 29x18.00R20 | 29.00" | -1.33% | +192 mm | 59.2 mph | calculate → |
| 305/45R20 | 30.81" | +4.82% | +40 mm | 62.9 mph | calculate → |
| 175/70R20 | 29.65" | +0.87% | -90 mm | 60.5 mph | calculate → |
| 195/55R20 | 28.44" | -3.22% | -70 mm | 58.1 mph | calculate → |
| 225/45R20 | 27.97" | -4.82% | -40 mm | 57.1 mph | calculate → |
| 155/65R20 | 27.93" | -4.96% | -110 mm | 57.0 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 | |
|---|---|---|---|---|---|
| 235/55R19 common | 29.18" | -0.72% | -30 mm | 59.6 mph | compare → |
| 245/55R19 common | 29.61" | +0.75% | -20 mm | 60.5 mph | compare → |
| 265/50R19 common | 29.43" | +0.15% | 0 mm | 60.1 mph | compare → |
| 265/40R21 common | 29.35" | -0.15% | 0 mm | 59.9 mph | compare → |
| 295/35R21 | 29.13" | -0.88% | +30 mm | 59.5 mph | compare → |
| 275/40R21 | 29.66" | +0.92% | +10 mm | 60.6 mph | compare → |
| 315/35R21 | 29.68" | +0.99% | +50 mm | 60.6 mph | compare → |
| 285/45R19 | 29.10" | -0.99% | +20 mm | 59.4 mph | compare → |
| 245/45R21 | 29.68" | +0.99% | -20 mm | 60.6 mph | compare → |
| 235/45R21 | 29.33" | -0.21% | -30 mm | 59.9 mph | calculate → |
| 305/35R21 | 29.41" | +0.05% | +40 mm | 60.0 mph | calculate → |
| 295/45R19 | 29.45" | +0.21% | +30 mm | 60.1 mph | calculate → |
| 345/30R21 | 29.15" | -0.82% | +80 mm | 59.5 mph | calculate → |
Try another size against 265/45R20
Questions
What size is 265/45R20 in inches?
265/45R20 is about 29.4" tall and 10.4" wide on a 20-inch rim — roughly a 29.5x10.50R20 in inch sizing.
What does 265/45R20 mean?
265 mm section width, sidewall 45% of the width (4.69"), radial construction, 20-inch rim.
What tire sizes are equivalent to 265/45R20?
On the same 20" rim, within 3% of the diameter: 295/40R20 (-0.33%), 235/50R20 (-0.47%), 305/40R20 (+0.74%), 175/70R20 (+0.87%), 245/50R20 (+0.87%), 255/45R20 (-1.21%).
How many revolutions per mile does a 265/45R20 tire make?
About 686 revolutions per mile (circumference 92.3").
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.