345/35R18 tire size
345/35R18 is a metric size: 27.5" tall, 13.6" wide, on a 18" rim — about a 27.5x13.50R18. The sidewall is 4.8" and the tire turns 733 times per mile.
345/35R18 specs
| Overall diameter (height) | 27.51" · 699 mm |
|---|---|
| Section width | 13.58" · 345 mm |
| Sidewall height | 4.75" · 121 mm (35% of width) |
| Rim diameter | 18" |
| Circumference | 86.42" · 2.195 m |
| Revolutions per mile | 733 (456 per km) |
| Inch (flotation) equivalent | 27.5x13.50R18 |
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 | |
|---|---|---|---|---|---|
| 245/45R18 common | 26.68" | -3.01% | -100 mm | 58.2 mph | calculate → |
| 235/50R18 common | 27.25" | -0.93% | -110 mm | 59.4 mph | calculate → |
| 235/55R18 common | 28.18" | +2.43% | -110 mm | 61.5 mph | calculate → |
| 235/45R18 common | 26.33" | -4.29% | -110 mm | 57.4 mph | calculate → |
| 225/60R18 common | 28.63" | +4.08% | -120 mm | 62.4 mph | calculate → |
| 225/50R18 common | 26.86" | -2.36% | -120 mm | 58.6 mph | calculate → |
| 225/55R18 common | 27.74" | +0.86% | -120 mm | 60.5 mph | calculate → |
| 245/50R18 common | 27.65" | +0.50% | -100 mm | 60.3 mph | calculate → |
| 255/45R18 common | 27.04" | -1.72% | -90 mm | 59.0 mph | calculate → |
| 215/55R18 common | 27.31" | -0.72% | -130 mm | 59.6 mph | calculate → |
| 275/40R18 common | 26.66" | -3.08% | -70 mm | 58.2 mph | calculate → |
| 245/55R18 | 28.61" | +4.01% | -100 mm | 62.4 mph | calculate → |
| 265/40R18 | 26.35" | -4.22% | -80 mm | 57.5 mph | calculate → |
| 275/45R18 | 27.74" | +0.86% | -70 mm | 60.5 mph | calculate → |
| 215/50R18 | 26.46" | -3.79% | -130 mm | 57.7 mph | calculate → |
| 265/45R18 | 27.39" | -0.43% | -80 mm | 59.7 mph | calculate → |
| 295/40R18 | 27.29" | -0.79% | -50 mm | 59.5 mph | calculate → |
| 285/40R18 | 26.98" | -1.93% | -60 mm | 58.8 mph | calculate → |
| 305/35R18 | 26.41" | -4.01% | -40 mm | 57.6 mph | calculate → |
| 295/45R18 | 28.45" | +3.43% | -50 mm | 62.1 mph | calculate → |
| 255/50R18 | 28.04" | +1.93% | -90 mm | 61.2 mph | calculate → |
| 315/40R18 | 27.92" | +1.50% | -30 mm | 60.9 mph | calculate → |
| 305/40R18 | 27.61" | +0.36% | -40 mm | 60.2 mph | calculate → |
| 215/60R18 | 28.16" | +2.36% | -130 mm | 61.4 mph | calculate → |
| 155/85R18 | 28.37" | +3.15% | -190 mm | 61.9 mph | calculate → |
| 305/45R18 | 28.81" | +4.72% | -40 mm | 62.8 mph | calculate → |
| 145/85R18 | 27.70" | +0.72% | -200 mm | 60.4 mph | calculate → |
| 145/80R18 | 27.13" | -1.36% | -200 mm | 59.2 mph | calculate → |
| 165/70R18 | 27.09" | -1.50% | -180 mm | 59.1 mph | calculate → |
| 28x12.00R18 | 28.00" | +1.79% | -40 mm | 61.1 mph | calculate → |
| 325/35R18 | 26.96" | -2.00% | -20 mm | 58.8 mph | calculate → |
| 285/45R18 | 28.10" | +2.15% | -60 mm | 61.3 mph | calculate → |
| 155/70R18 | 26.54" | -3.51% | -190 mm | 57.9 mph | calculate → |
| 205/60R18 | 27.69" | +0.64% | -140 mm | 60.4 mph | calculate → |
| 195/60R18 | 27.21" | -1.07% | -150 mm | 59.4 mph | calculate → |
| 28x10.00R18 | 28.00" | +1.79% | -91 mm | 61.1 mph | calculate → |
| 315/35R18 | 26.68" | -3.01% | -30 mm | 58.2 mph | calculate → |
| 265/50R18 | 28.43" | +3.36% | -80 mm | 62.0 mph | calculate → |
| 345/30R18 | 26.15" | -4.94% | 0 mm | 57.0 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 | |
|---|---|---|---|---|---|
| 245/45R19 common | 27.68" | +0.63% | -100 mm | 60.4 mph | calculate → |
| 225/60R17 common | 27.63" | +0.44% | -120 mm | 60.3 mph | calculate → |
| 275/40R19 common | 27.66" | +0.56% | -70 mm | 60.3 mph | calculate → |
| 235/45R19 common | 27.33" | -0.66% | -110 mm | 59.6 mph | calculate → |
| 265/40R19 | 27.35" | -0.59% | -80 mm | 59.6 mph | calculate → |
| 245/55R17 | 27.61" | +0.37% | -100 mm | 60.2 mph | calculate → |
| 305/35R19 | 27.41" | -0.37% | -40 mm | 59.8 mph | calculate → |
| 155/70R19 | 27.54" | +0.13% | -190 mm | 60.1 mph | calculate → |
| 355/30R19 | 27.39" | -0.44% | +10 mm | 59.7 mph | calculate → |
| 215/50R19 | 27.46" | -0.16% | -130 mm | 59.9 mph | calculate → |
| 165/80R17 | 27.39" | -0.42% | -180 mm | 59.8 mph | calculate → |
| 175/60R19 | 27.27" | -0.87% | -170 mm | 59.5 mph | calculate → |
| 315/35R19 | 27.68" | +0.63% | -30 mm | 60.4 mph | calculate → |
| 145/90R17 | 27.28" | -0.84% | -200 mm | 59.5 mph | calculate → |
| 205/65R17 | 27.49" | -0.06% | -140 mm | 60.0 mph | calculate → |
Try another size against 345/35R18
Questions
What size is 345/35R18 in inches?
345/35R18 is about 27.5" tall and 13.6" wide on a 18-inch rim — roughly a 27.5x13.50R18 in inch sizing.
What does 345/35R18 mean?
345 mm section width, sidewall 35% of the width (4.75"), radial construction, 18-inch rim.
What tire sizes are equivalent to 345/35R18?
On the same 18" rim, within 3% of the diameter: 305/40R18 (+0.36%), 265/45R18 (-0.43%), 245/50R18 (+0.50%), 205/60R18 (+0.64%), 215/55R18 (-0.72%), 145/85R18 (+0.72%).
How many revolutions per mile does a 345/35R18 tire make?
About 733 revolutions per mile (circumference 86.4").
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.