235/35R18 tire size
235/35R18 is a metric size: 24.5" tall, 9.3" wide, on a 18" rim — about a 24.5x9.50R18. The sidewall is 3.2" and the tire turns 824 times per mile.
235/35R18 specs
| Overall diameter (height) | 24.48" · 622 mm |
|---|---|
| Section width | 9.25" · 235 mm |
| Sidewall height | 3.24" · 82 mm (35% of width) |
| Rim diameter | 18" |
| Circumference | 76.89" · 1.953 m |
| Revolutions per mile | 824 (512 per km) |
| Inch (flotation) equivalent | 24.5x9.50R18 |
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" | +2.49% | -10 mm | 61.5 mph | calculate → |
| 235/40R18 common | 25.40" | +3.78% | 0 mm | 62.3 mph | calculate → |
| 255/35R18 common | 25.03" | +2.25% | +20 mm | 61.4 mph | calculate → |
| 275/35R18 common | 25.58" | +4.50% | +40 mm | 62.7 mph | calculate → |
| 265/35R18 common | 25.30" | +3.38% | +30 mm | 62.0 mph | calculate → |
| 215/45R18 common | 25.62" | +4.66% | -20 mm | 62.8 mph | calculate → |
| 245/35R18 common | 24.75" | +1.13% | +10 mm | 60.7 mph | calculate → |
| 215/40R18 | 24.77" | +1.21% | -20 mm | 60.7 mph | calculate → |
| 295/30R18 | 24.97" | +2.01% | +60 mm | 61.2 mph | calculate → |
| 285/30R18 | 24.73" | +1.05% | +50 mm | 60.6 mph | calculate → |
| 315/30R18 | 25.44" | +3.94% | +80 mm | 62.4 mph | calculate → |
| 205/40R18 | 24.46" | -0.08% | -30 mm | 60.0 mph | calculate → |
| 225/35R18 | 24.20" | -1.13% | -10 mm | 59.3 mph | calculate → |
| 215/35R18 | 23.93" | -2.25% | -20 mm | 58.6 mph | calculate → |
| 305/30R18 | 25.20" | +2.98% | +70 mm | 61.8 mph | calculate → |
| 205/35R18 | 23.65" | -3.38% | -30 mm | 58.0 mph | calculate → |
| 155/60R18 | 25.32" | +3.46% | -80 mm | 62.1 mph | calculate → |
| 235/30R18 | 23.55" | -3.78% | 0 mm | 57.7 mph | calculate → |
| 205/45R18 | 25.26" | +3.22% | -30 mm | 61.9 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 | |
|---|---|---|---|---|---|
| 215/45R17 common | 24.62" | +0.58% | -20 mm | 60.3 mph | calculate → |
| 205/45R17 common | 24.26" | -0.87% | -30 mm | 59.5 mph | calculate → |
| 245/40R17 common | 24.72" | +0.98% | +10 mm | 60.6 mph | calculate → |
| 235/40R17 | 24.40" | -0.31% | 0 mm | 59.8 mph | calculate → |
| 275/35R17 | 24.58" | +0.42% | +40 mm | 60.3 mph | calculate → |
| 235/30R19 | 24.55" | +0.31% | 0 mm | 60.2 mph | calculate → |
Try another size against 235/35R18
Questions
What size is 235/35R18 in inches?
235/35R18 is about 24.5" tall and 9.3" wide on a 18-inch rim — roughly a 24.5x9.50R18 in inch sizing.
What does 235/35R18 mean?
235 mm section width, sidewall 35% of the width (3.24"), radial construction, 18-inch rim.
What tire sizes are equivalent to 235/35R18?
On the same 18" rim, within 3% of the diameter: 205/40R18 (-0.08%), 285/30R18 (+1.05%), 225/35R18 (-1.13%), 245/35R18 (+1.13%), 215/40R18 (+1.21%), 295/30R18 (+2.01%).
How many revolutions per mile does a 235/35R18 tire make?
About 824 revolutions per mile (circumference 76.9").
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.