275/65R18 tire size
275/65R18 is a metric size: 32.1" tall, 10.8" wide, on a 18" rim — about a 32x11.00R18. The sidewall is 7.0" and the tire turns 629 times per mile.
275/65R18 specs
| Overall diameter (height) | 32.07" · 815 mm |
|---|---|
| Section width | 10.83" · 275 mm |
| Sidewall height | 7.04" · 179 mm (65% of width) |
| Rim diameter | 18" |
| Circumference | 100.77" · 2.559 m |
| Revolutions per mile | 629 (391 per km) |
| Inch (flotation) equivalent | 32x11.00R18 |
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 | |
|---|---|---|---|---|---|
| 265/60R18 common | 30.52" | -4.85% | -10 mm | 57.1 mph | compare → |
| 275/70R18 common | 33.16" | +3.38% | 0 mm | 62.0 mph | compare → |
| 265/65R18 common | 31.56" | -1.60% | -10 mm | 59.0 mph | compare → |
| 265/70R18 common | 32.61" | +1.66% | -10 mm | 61.0 mph | compare → |
| 255/70R18 common | 32.06" | -0.06% | -20 mm | 60.0 mph | compare → |
| 255/65R18 common | 31.05" | -3.19% | -20 mm | 58.1 mph | compare → |
| 285/65R18 common | 32.59" | +1.60% | +10 mm | 61.0 mph | compare → |
| 33x12.50R18 | 33.00" | +2.88% | +43 mm | 61.7 mph | compare → |
| 285/60R18 | 31.46" | -1.90% | +10 mm | 58.9 mph | compare → |
| 305/65R18 | 33.61" | +4.79% | +30 mm | 62.9 mph | compare → |
| 275/60R18 | 30.99" | -3.38% | 0 mm | 58.0 mph | compare → |
| 305/60R18 | 32.41" | +1.04% | +30 mm | 60.6 mph | compare → |
| 325/60R18 | 33.35" | +3.99% | +50 mm | 62.4 mph | compare → |
| 245/75R18 | 32.47" | +1.23% | -30 mm | 60.7 mph | calculate → |
| 295/65R18 | 33.10" | +3.19% | +20 mm | 61.9 mph | calculate → |
| 245/70R18 | 31.50" | -1.78% | -30 mm | 58.9 mph | calculate → |
| 235/80R18 | 32.80" | +2.27% | -40 mm | 61.4 mph | calculate → |
| 33x11.50R18 | 33.00" | +2.88% | +17 mm | 61.7 mph | calculate → |
| 33x13.50R18 | 33.00" | +2.88% | +68 mm | 61.7 mph | calculate → |
| 33x13.00R18 | 33.00" | +2.88% | +55 mm | 61.7 mph | calculate → |
| 235/70R18 | 30.95" | -3.50% | -40 mm | 57.9 mph | calculate → |
| 245/65R18 | 30.54" | -4.79% | -30 mm | 57.1 mph | calculate → |
| 33x10.50R18 | 33.00" | +2.88% | -8 mm | 61.7 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 | |
|---|---|---|---|---|---|
| 235/80R17 common | 31.80" | -0.85% | -40 mm | 59.5 mph | compare → |
| 255/75R17 | 32.06" | -0.05% | -20 mm | 60.0 mph | compare → |
| 275/70R17 | 32.16" | +0.26% | 0 mm | 60.2 mph | compare → |
| 255/65R19 | 32.05" | -0.07% | -20 mm | 60.0 mph | calculate → |
| 32x11.50R17 | 32.00" | -0.23% | +17 mm | 59.9 mph | calculate → |
| 315/60R17 | 31.88" | -0.60% | +40 mm | 59.6 mph | calculate → |
| 32x10.50R17 | 32.00" | -0.23% | -8 mm | 59.9 mph | calculate → |
Try another size against 275/65R18
Questions
What size is 275/65R18 in inches?
275/65R18 is about 32.1" tall and 10.8" wide on a 18-inch rim — roughly a 32x11.00R18 in inch sizing.
What does 275/65R18 mean?
275 mm section width, sidewall 65% of the width (7.04"), radial construction, 18-inch rim.
What tire sizes are equivalent to 275/65R18?
On the same 18" rim, within 3% of the diameter: 255/70R18 (-0.06%), 305/60R18 (+1.04%), 245/75R18 (+1.23%), 265/65R18 (-1.60%), 285/65R18 (+1.60%), 265/70R18 (+1.66%).
How many revolutions per mile does a 275/65R18 tire make?
About 629 revolutions per mile (circumference 100.8").
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.