255/35R18 tire size
255/35R18 is a metric size: 25.0" tall, 10.0" wide, on a 18" rim — about a 25x10.00R18. The sidewall is 3.5" and the tire turns 806 times per mile.
255/35R18 specs
| Overall diameter (height) | 25.03" · 636 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 3.51" · 89 mm (35% of width) |
| Rim diameter | 18" |
| Circumference | 78.63" · 1.997 m |
| Revolutions per mile | 806 (501 per km) |
| Inch (flotation) equivalent | 25x10.00R18 |
Equivalent sizes on a 18" 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 | |
|---|---|---|---|---|---|
| 245/40R18 common | 25.72" | +2.75% | -10 mm | 61.7 mph | compare → |
| 225/45R18 common | 25.97" | +3.78% | -30 mm | 62.3 mph | compare → |
| 225/40R18 common | 25.09" | +0.24% | -30 mm | 60.1 mph | compare → |
| 235/40R18 common | 25.40" | +1.49% | -20 mm | 60.9 mph | compare → |
| 255/40R18 common | 26.03" | +4.01% | 0 mm | 62.4 mph | compare → |
| 275/35R18 common | 25.58" | +2.20% | +20 mm | 61.3 mph | compare → |
| 265/35R18 common | 25.30" | +1.10% | +10 mm | 60.7 mph | compare → |
| 215/45R18 common | 25.62" | +2.36% | -40 mm | 61.4 mph | compare → |
| 245/35R18 common | 24.75" | -1.10% | -10 mm | 59.3 mph | compare → |
| 215/40R18 | 24.77" | -1.02% | -40 mm | 59.4 mph | compare → |
| 285/35R18 | 25.85" | +3.30% | +30 mm | 62.0 mph | compare → |
| 295/30R18 | 24.97" | -0.24% | +40 mm | 59.9 mph | compare → |
| 285/30R18 | 24.73" | -1.18% | +30 mm | 59.3 mph | compare → |
| 315/30R18 | 25.44" | +1.65% | +60 mm | 61.0 mph | compare → |
| 295/35R18 | 26.13" | +4.40% | +40 mm | 62.6 mph | compare → |
| 205/40R18 | 24.46" | -2.28% | -50 mm | 58.6 mph | compare → |
| 335/30R18 | 25.91" | +3.54% | +80 mm | 62.1 mph | compare → |
| 225/35R18 | 24.20" | -3.30% | -30 mm | 58.0 mph | calculate → |
| 215/35R18 | 23.93" | -4.40% | -40 mm | 57.4 mph | calculate → |
| 235/35R18 | 24.48" | -2.20% | -20 mm | 58.7 mph | calculate → |
| 305/30R18 | 25.20" | +0.71% | +50 mm | 60.4 mph | calculate → |
| 155/60R18 | 25.32" | +1.18% | -100 mm | 60.7 mph | calculate → |
| 145/70R18 | 25.99" | +3.85% | -110 mm | 62.3 mph | calculate → |
| 26x12.00R18 | 26.00" | +3.89% | +50 mm | 62.3 mph | calculate → |
| 26x6.00R18 | 26.00" | +3.89% | -103 mm | 62.3 mph | calculate → |
| 26x8.00R18 | 26.00" | +3.89% | -52 mm | 62.3 mph | calculate → |
| 205/45R18 | 25.26" | +0.94% | -50 mm | 60.6 mph | calculate → |
| 345/30R18 | 26.15" | +4.48% | +90 mm | 62.7 mph | calculate → |
Plus / minus sizing: 17" and 19" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 225/45R17 common | 24.97" | -0.22% | -30 mm | 59.9 mph | compare → |
| 205/50R17 common | 25.07" | +0.17% | -50 mm | 60.1 mph | compare → |
| 255/40R17 common | 25.03" | +0.02% | 0 mm | 60.0 mph | compare → |
| 225/35R19 | 25.20" | +0.69% | -30 mm | 60.4 mph | compare → |
| 255/30R19 | 25.02" | -0.02% | 0 mm | 60.0 mph | compare → |
| 265/30R19 | 25.26" | +0.93% | +10 mm | 60.6 mph | compare → |
| 245/30R19 | 24.79" | -0.96% | -10 mm | 59.4 mph | calculate → |
| 295/35R17 | 25.13" | +0.41% | +40 mm | 60.2 mph | calculate → |
| 315/25R19 | 25.20" | +0.69% | +60 mm | 60.4 mph | calculate → |
| 295/25R19 | 24.81" | -0.88% | +40 mm | 59.5 mph | calculate → |
| 145/70R17 | 24.99" | -0.14% | -110 mm | 59.9 mph | calculate → |
| 215/35R19 | 24.93" | -0.41% | -40 mm | 59.8 mph | calculate → |
Try another size against 255/35R18
Questions
What size is 255/35R18 in inches?
255/35R18 is about 25.0" tall and 10.0" wide on a 18-inch rim — roughly a 25x10.00R18 in inch sizing.
What does 255/35R18 mean?
255 mm section width, sidewall 35% of the width (3.51"), radial construction, 18-inch rim.
What tire sizes are equivalent to 255/35R18?
On the same 18" rim, within 3% of the diameter: 225/40R18 (+0.24%), 295/30R18 (-0.24%), 305/30R18 (+0.71%), 205/45R18 (+0.94%), 215/40R18 (-1.02%), 245/35R18 (-1.10%).
How many revolutions per mile does a 255/35R18 tire make?
About 806 revolutions per mile (circumference 78.6").
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.