275/70R18 tire size
275/70R18 is a metric size: 33.2" tall, 10.8" wide, on a 18" rim — about a 33x11.00R18. The sidewall is 7.6" and the tire turns 608 times per mile.
275/70R18 specs
| Overall diameter (height) | 33.16" · 842 mm |
|---|---|
| Section width | 10.83" · 275 mm |
| Sidewall height | 7.58" · 193 mm (70% of width) |
| Rim diameter | 18" |
| Circumference | 104.17" · 2.646 m |
| Revolutions per mile | 608 (378 per km) |
| Inch (flotation) equivalent | 33x11.00R18 |
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 | |
|---|---|---|---|---|---|
| 275/65R18 common | 32.07" | -3.27% | 0 mm | 58.0 mph | compare → |
| 265/65R18 common | 31.56" | -4.81% | -10 mm | 57.1 mph | compare → |
| 265/70R18 common | 32.61" | -1.66% | -10 mm | 59.0 mph | compare → |
| 255/70R18 common | 32.06" | -3.32% | -20 mm | 58.0 mph | compare → |
| 285/65R18 common | 32.59" | -1.72% | +10 mm | 59.0 mph | compare → |
| 295/70R18 common | 34.26" | +3.32% | +20 mm | 62.0 mph | compare → |
| 33x12.50R18 | 33.00" | -0.47% | +43 mm | 59.7 mph | compare → |
| 325/65R18 | 34.63" | +4.45% | +50 mm | 62.7 mph | compare → |
| 305/70R18 | 34.81" | +4.99% | +30 mm | 63.0 mph | compare → |
| 305/65R18 | 33.61" | +1.37% | +30 mm | 60.8 mph | compare → |
| 285/70R18 | 33.71" | +1.66% | +10 mm | 61.0 mph | compare → |
| 305/60R18 | 32.41" | -2.26% | +30 mm | 58.6 mph | compare → |
| 325/60R18 | 33.35" | +0.59% | +50 mm | 60.4 mph | compare → |
| 245/75R18 | 32.47" | -2.08% | -30 mm | 58.8 mph | calculate → |
| 295/65R18 | 33.10" | -0.18% | +20 mm | 59.9 mph | calculate → |
| 245/70R18 | 31.50" | -4.99% | -30 mm | 57.0 mph | calculate → |
| 33x11.50R18 | 33.00" | -0.47% | +17 mm | 59.7 mph | calculate → |
| 33x13.50R18 | 33.00" | -0.47% | +68 mm | 59.7 mph | calculate → |
| 33x13.00R18 | 33.00" | -0.47% | +55 mm | 59.7 mph | calculate → |
| 235/80R18 | 32.80" | -1.07% | -40 mm | 59.4 mph | calculate → |
| 34x12.50R18 | 34.00" | +2.54% | +43 mm | 61.5 mph | calculate → |
| 33x10.50R18 | 33.00" | -0.47% | -8 mm | 59.7 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 | |
|---|---|---|---|---|---|
| 295/70R17 | 33.26" | +0.31% | +20 mm | 60.2 mph | compare → |
| 33x12.50R17 | 33.00" | -0.47% | +43 mm | 59.7 mph | compare → |
| 255/80R17 | 33.06" | -0.28% | -20 mm | 59.8 mph | compare → |
| 33x10.50R17 | 33.00" | -0.47% | -8 mm | 59.7 mph | calculate → |
| 33x11.50R17 | 33.00" | -0.47% | +17 mm | 59.7 mph | calculate → |
| 33x13.50R17 | 33.00" | -0.47% | +68 mm | 59.7 mph | calculate → |
| 33x13.00R17 | 33.00" | -0.47% | +55 mm | 59.7 mph | calculate → |
| 33x9.50R17 | 33.00" | -0.47% | -34 mm | 59.7 mph | calculate → |
Try another size against 275/70R18
Questions
What size is 275/70R18 in inches?
275/70R18 is about 33.2" tall and 10.8" wide on a 18-inch rim — roughly a 33x11.00R18 in inch sizing.
What does 275/70R18 mean?
275 mm section width, sidewall 70% of the width (7.58"), radial construction, 18-inch rim.
What tire sizes are equivalent to 275/70R18?
On the same 18" rim, within 3% of the diameter: 295/65R18 (-0.18%), 33x10.50R18 (-0.47%), 33x11.50R18 (-0.47%), 33x12.50R18 (-0.47%), 33x13.50R18 (-0.47%), 33x13.00R18 (-0.47%).
How many revolutions per mile does a 275/70R18 tire make?
About 608 revolutions per mile (circumference 104.2").
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.