255/35R20 tire size
255/35R20 is a metric size: 27.0" tall, 10.0" wide, on a 20" rim — about a 27x10.00R20. The sidewall is 3.5" and the tire turns 746 times per mile.
255/35R20 specs
| Overall diameter (height) | 27.03" · 687 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 3.51" · 89 mm (35% of width) |
| Rim diameter | 20" |
| Circumference | 84.91" · 2.157 m |
| Revolutions per mile | 746 (464 per km) |
| Inch (flotation) equivalent | 27x10.00R20 |
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" | +2.55% | -10 mm | 61.5 mph | compare → |
| 245/35R20 common | 26.75" | -1.02% | -10 mm | 59.4 mph | compare → |
| 275/35R20 common | 27.58" | +2.04% | +20 mm | 61.2 mph | compare → |
| 255/40R20 common | 28.03" | +3.71% | 0 mm | 62.2 mph | compare → |
| 285/35R20 common | 27.85" | +3.06% | +30 mm | 61.8 mph | compare → |
| 285/30R20 common | 26.73" | -1.09% | +30 mm | 59.3 mph | compare → |
| 275/30R20 common | 26.50" | -1.97% | +20 mm | 58.8 mph | compare → |
| 265/35R20 common | 27.30" | +1.02% | +10 mm | 60.6 mph | compare → |
| 235/35R20 | 26.48" | -2.04% | -20 mm | 58.8 mph | compare → |
| 295/30R20 | 26.97" | -0.22% | +40 mm | 59.9 mph | compare → |
| 305/30R20 | 27.20" | +0.66% | +50 mm | 60.4 mph | compare → |
| 295/35R20 | 28.13" | +4.08% | +40 mm | 62.4 mph | compare → |
| 245/30R20 | 25.79" | -4.59% | -10 mm | 57.2 mph | compare → |
| 265/30R20 | 26.26" | -2.84% | +10 mm | 58.3 mph | compare → |
| 255/30R20 | 26.02" | -3.71% | 0 mm | 57.8 mph | compare → |
| 235/45R20 | 28.33" | +4.81% | -20 mm | 62.9 mph | compare → |
| 225/35R20 | 26.20" | -3.06% | -30 mm | 58.2 mph | compare → |
| 265/40R20 | 28.35" | +4.88% | +10 mm | 62.9 mph | compare → |
| 335/25R20 | 26.59" | -1.60% | +80 mm | 59.0 mph | compare → |
| 315/30R20 | 27.44" | +1.53% | +60 mm | 60.9 mph | compare → |
| 305/25R20 | 26.00" | -3.79% | +50 mm | 57.7 mph | compare → |
| 235/40R20 | 27.40" | +1.38% | -20 mm | 60.8 mph | calculate → |
| 335/30R20 | 27.91" | +3.28% | +80 mm | 62.0 mph | calculate → |
| 295/25R20 | 25.81" | -4.52% | +40 mm | 57.3 mph | calculate → |
| 325/25R20 | 26.40" | -2.33% | +70 mm | 58.6 mph | calculate → |
| 325/30R20 | 27.68" | +2.40% | +70 mm | 61.4 mph | calculate → |
| 345/30R20 | 28.15" | +4.15% | +90 mm | 62.5 mph | calculate → |
| 215/45R20 | 27.62" | +2.18% | -40 mm | 61.3 mph | calculate → |
| 345/25R20 | 26.79" | -0.87% | +90 mm | 59.5 mph | calculate → |
| 225/40R20 | 27.09" | +0.22% | -30 mm | 60.1 mph | calculate → |
| 195/50R20 | 27.68" | +2.40% | -60 mm | 61.4 mph | calculate → |
| 145/60R20 | 26.85" | -0.66% | -110 mm | 59.6 mph | calculate → |
| 155/60R20 | 27.32" | +1.09% | -100 mm | 60.7 mph | calculate → |
| 145/65R20 | 27.42" | +1.46% | -110 mm | 60.9 mph | calculate → |
| 175/55R20 | 27.58" | +2.04% | -80 mm | 61.2 mph | calculate → |
| 165/60R20 | 27.80" | +2.84% | -90 mm | 61.7 mph | calculate → |
| 315/25R20 | 26.20" | -3.06% | +60 mm | 58.2 mph | calculate → |
| 155/65R20 | 27.93" | +3.35% | -100 mm | 62.0 mph | calculate → |
| 225/45R20 | 27.97" | +3.50% | -30 mm | 62.1 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 | |
|---|---|---|---|---|---|
| 255/40R19 common | 27.03" | +0.01% | 0 mm | 60.0 mph | compare → |
| 225/45R19 common | 26.97" | -0.20% | -30 mm | 59.9 mph | compare → |
| 285/35R19 common | 26.85" | -0.64% | +30 mm | 59.6 mph | compare → |
| 295/35R19 | 27.13" | +0.38% | +40 mm | 60.2 mph | compare → |
| 345/30R19 | 27.15" | +0.45% | +90 mm | 60.3 mph | compare → |
| 255/30R21 | 27.02" | -0.01% | 0 mm | 60.0 mph | calculate → |
| 295/25R21 | 26.81" | -0.82% | +40 mm | 59.5 mph | calculate → |
| 265/30R21 | 27.26" | +0.86% | +10 mm | 60.5 mph | calculate → |
| 305/25R21 | 27.00" | -0.09% | +50 mm | 59.9 mph | calculate → |
| 175/60R19 | 27.27" | +0.89% | -80 mm | 60.5 mph | calculate → |
| 245/30R21 | 26.79" | -0.89% | -10 mm | 59.5 mph | calculate → |
| 335/30R19 | 26.91" | -0.42% | +80 mm | 59.7 mph | calculate → |
Try another size against 255/35R20
Questions
What size is 255/35R20 in inches?
255/35R20 is about 27.0" tall and 10.0" wide on a 20-inch rim — roughly a 27x10.00R20 in inch sizing.
What does 255/35R20 mean?
255 mm section width, sidewall 35% of the width (3.51"), radial construction, 20-inch rim.
What tire sizes are equivalent to 255/35R20?
On the same 20" rim, within 3% of the diameter: 225/40R20 (+0.22%), 295/30R20 (-0.22%), 305/30R20 (+0.66%), 145/60R20 (-0.66%), 345/25R20 (-0.87%), 245/35R20 (-1.02%).
How many revolutions per mile does a 255/35R20 tire make?
About 746 revolutions per mile (circumference 84.9").
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.