225/35R18 tire size
225/35R18 is a metric size: 24.2" tall, 8.9" wide, on a 18" rim — about a 24x9.00R18. The sidewall is 3.1" and the tire turns 833 times per mile.
225/35R18 specs
| Overall diameter (height) | 24.20" · 615 mm |
|---|---|
| Section width | 8.86" · 225 mm |
| Sidewall height | 3.10" · 79 mm (35% of width) |
| Rim diameter | 18" |
| Circumference | 76.03" · 1.931 m |
| Revolutions per mile | 833 (518 per km) |
| Inch (flotation) equivalent | 24x9.00R18 |
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 | |
|---|---|---|---|---|---|
| 225/40R18 common | 25.09" | +3.66% | 0 mm | 62.2 mph | calculate → |
| 235/40R18 common | 25.40" | +4.96% | +10 mm | 63.0 mph | calculate → |
| 255/35R18 common | 25.03" | +3.42% | +30 mm | 62.0 mph | calculate → |
| 265/35R18 common | 25.30" | +4.56% | +40 mm | 62.7 mph | calculate → |
| 245/35R18 common | 24.75" | +2.28% | +20 mm | 61.4 mph | calculate → |
| 215/40R18 | 24.77" | +2.36% | -10 mm | 61.4 mph | calculate → |
| 295/30R18 | 24.97" | +3.17% | +70 mm | 61.9 mph | calculate → |
| 285/30R18 | 24.73" | +2.20% | +60 mm | 61.3 mph | calculate → |
| 205/40R18 | 24.46" | +1.06% | -20 mm | 60.6 mph | calculate → |
| 215/35R18 | 23.93" | -1.14% | -10 mm | 59.3 mph | calculate → |
| 235/35R18 | 24.48" | +1.14% | +10 mm | 60.7 mph | calculate → |
| 205/35R18 | 23.65" | -2.28% | -20 mm | 58.6 mph | calculate → |
| 235/30R18 | 23.55" | -2.68% | +10 mm | 58.4 mph | calculate → |
| 305/30R18 | 25.20" | +4.15% | +80 mm | 62.5 mph | calculate → |
| 155/60R18 | 25.32" | +4.64% | -70 mm | 62.8 mph | calculate → |
| 205/45R18 | 25.26" | +4.39% | -20 mm | 62.6 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 | |
|---|---|---|---|---|---|
| 205/45R17 common | 24.26" | +0.26% | -20 mm | 60.2 mph | calculate → |
| 235/40R17 | 24.40" | +0.83% | +10 mm | 60.5 mph | calculate → |
| 225/40R17 | 24.09" | -0.47% | 0 mm | 59.7 mph | calculate → |
Try another size against 225/35R18
Questions
What size is 225/35R18 in inches?
225/35R18 is about 24.2" tall and 8.9" wide on a 18-inch rim — roughly a 24x9.00R18 in inch sizing.
What does 225/35R18 mean?
225 mm section width, sidewall 35% of the width (3.10"), radial construction, 18-inch rim.
What tire sizes are equivalent to 225/35R18?
On the same 18" rim, within 3% of the diameter: 205/40R18 (+1.06%), 235/35R18 (+1.14%), 215/35R18 (-1.14%), 285/30R18 (+2.20%), 205/35R18 (-2.28%), 245/35R18 (+2.28%).
How many revolutions per mile does a 225/35R18 tire make?
About 833 revolutions per mile (circumference 76.0").
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.