275/60R18 tire size
275/60R18 is a metric size: 31.0" tall, 10.8" wide, on a 18" rim — about a 31x11.00R18. The sidewall is 6.5" and the tire turns 651 times per mile.
275/60R18 specs
| Overall diameter (height) | 30.99" · 787 mm |
|---|---|
| Section width | 10.83" · 275 mm |
| Sidewall height | 6.50" · 165 mm (60% of width) |
| Rim diameter | 18" |
| Circumference | 97.36" · 2.473 m |
| Revolutions per mile | 651 (404 per km) |
| Inch (flotation) equivalent | 31x11.00R18 |
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" | +3.49% | 0 mm | 62.1 mph | compare → |
| 265/60R18 common | 30.52" | -1.52% | -10 mm | 59.1 mph | compare → |
| 245/60R18 common | 29.57" | -4.57% | -30 mm | 57.3 mph | compare → |
| 265/65R18 common | 31.56" | +1.84% | -10 mm | 61.1 mph | compare → |
| 235/65R18 common | 30.03" | -3.11% | -40 mm | 58.1 mph | compare → |
| 255/70R18 common | 32.06" | +3.43% | -20 mm | 62.1 mph | compare → |
| 255/65R18 common | 31.05" | +0.19% | -20 mm | 60.1 mph | compare → |
| 255/60R18 | 30.05" | -3.05% | -20 mm | 58.2 mph | compare → |
| 285/60R18 | 31.46" | +1.52% | +10 mm | 60.9 mph | compare → |
| 305/60R18 | 32.41" | +4.57% | +30 mm | 62.7 mph | compare → |
| 245/75R18 | 32.47" | +4.76% | -30 mm | 62.9 mph | calculate → |
| 245/70R18 | 31.50" | +1.65% | -30 mm | 61.0 mph | calculate → |
| 165/90R18 | 29.69" | -4.19% | -110 mm | 57.5 mph | calculate → |
| 235/70R18 | 30.95" | -0.13% | -40 mm | 59.9 mph | calculate → |
| 245/65R18 | 30.54" | -1.46% | -30 mm | 59.1 mph | calculate → |
| 175/90R18 | 30.40" | -1.91% | -100 mm | 58.9 mph | calculate → |
| 285/55R18 | 30.34" | -2.10% | +10 mm | 58.7 mph | calculate → |
| 275/55R18 | 29.91" | -3.49% | 0 mm | 57.9 mph | calculate → |
| 325/45R18 | 29.52" | -4.76% | +50 mm | 57.1 mph | calculate → |
| 225/65R18 | 29.52" | -4.76% | -50 mm | 57.1 mph | calculate → |
| 265/55R18 | 29.48" | -4.89% | -10 mm | 57.1 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 | |
|---|---|---|---|---|---|
| 255/60R19 common | 31.05" | +0.18% | -20 mm | 60.1 mph | compare → |
| 255/70R17 common | 31.06" | +0.20% | -20 mm | 60.1 mph | compare → |
| 235/75R17 | 30.88" | -0.37% | -40 mm | 59.8 mph | compare → |
| 275/55R19 | 30.91" | -0.27% | 0 mm | 59.8 mph | compare → |
| 275/65R17 | 31.07" | +0.27% | 0 mm | 60.2 mph | calculate → |
| 235/65R19 | 31.03" | +0.11% | -40 mm | 60.1 mph | calculate → |
| 31x10.50R17 | 31.00" | +0.03% | -8 mm | 60.0 mph | calculate → |
| 165/90R19 | 30.69" | -0.97% | -110 mm | 59.4 mph | calculate → |
Try another size against 275/60R18
Questions
What size is 275/60R18 in inches?
275/60R18 is about 31.0" tall and 10.8" wide on a 18-inch rim — roughly a 31x11.00R18 in inch sizing.
What does 275/60R18 mean?
275 mm section width, sidewall 60% of the width (6.50"), radial construction, 18-inch rim.
What tire sizes are equivalent to 275/60R18?
On the same 18" rim, within 3% of the diameter: 235/70R18 (-0.13%), 255/65R18 (+0.19%), 245/65R18 (-1.46%), 265/60R18 (-1.52%), 285/60R18 (+1.52%), 245/70R18 (+1.65%).
How many revolutions per mile does a 275/60R18 tire make?
About 651 revolutions per mile (circumference 97.4").
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.