265/65R18 tire size
265/65R18 is a metric size: 31.6" tall, 10.4" wide, on a 18" rim — about a 31.5x10.50R18. The sidewall is 6.8" and the tire turns 639 times per mile.
265/65R18 specs
| Overall diameter (height) | 31.56" · 802 mm |
|---|---|
| Section width | 10.43" · 265 mm |
| Sidewall height | 6.78" · 172 mm (65% of width) |
| Rim diameter | 18" |
| Circumference | 99.16" · 2.519 m |
| Revolutions per mile | 639 (397 per km) |
| Inch (flotation) equivalent | 31.5x10.50R18 |
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 | |
|---|---|---|---|---|---|
| 275/65R18 common | 32.07" | +1.62% | +10 mm | 61.0 mph | compare → |
| 265/60R18 common | 30.52" | -3.31% | 0 mm | 58.0 mph | compare → |
| 265/70R18 common | 32.61" | +3.31% | 0 mm | 62.0 mph | compare → |
| 235/65R18 common | 30.03" | -4.86% | -30 mm | 57.1 mph | compare → |
| 255/70R18 common | 32.06" | +1.56% | -10 mm | 60.9 mph | compare → |
| 255/65R18 common | 31.05" | -1.62% | -10 mm | 59.0 mph | compare → |
| 285/65R18 common | 32.59" | +3.24% | +20 mm | 61.9 mph | compare → |
| 255/60R18 | 30.05" | -4.80% | -10 mm | 57.1 mph | compare → |
| 33x12.50R18 | 33.00" | +4.55% | +53 mm | 62.7 mph | compare → |
| 285/60R18 | 31.46" | -0.31% | +20 mm | 59.8 mph | compare → |
| 275/60R18 | 30.99" | -1.81% | +10 mm | 58.9 mph | compare → |
| 305/60R18 | 32.41" | +2.68% | +40 mm | 61.6 mph | compare → |
| 245/75R18 | 32.47" | +2.87% | -20 mm | 61.7 mph | calculate → |
| 295/65R18 | 33.10" | +4.86% | +30 mm | 62.9 mph | calculate → |
| 245/70R18 | 31.50" | -0.19% | -20 mm | 59.9 mph | calculate → |
| 235/70R18 | 30.95" | -1.93% | -30 mm | 58.8 mph | calculate → |
| 245/65R18 | 30.54" | -3.24% | -20 mm | 58.1 mph | calculate → |
| 175/90R18 | 30.40" | -3.68% | -90 mm | 57.8 mph | calculate → |
| 285/55R18 | 30.34" | -3.87% | +20 mm | 57.7 mph | calculate → |
| 235/80R18 | 32.80" | +3.93% | -30 mm | 62.4 mph | calculate → |
| 33x11.50R18 | 33.00" | +4.55% | +27 mm | 62.7 mph | calculate → |
| 33x13.50R18 | 33.00" | +4.55% | +78 mm | 62.7 mph | calculate → |
| 33x13.00R18 | 33.00" | +4.55% | +65 mm | 62.7 mph | calculate → |
| 33x10.50R18 | 33.00" | +4.55% | +2 mm | 62.7 mph | calculate → |
Plus / minus sizing: 17" and 19" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
Try another size against 265/65R18
Questions
What size is 265/65R18 in inches?
265/65R18 is about 31.6" tall and 10.4" wide on a 18-inch rim — roughly a 31.5x10.50R18 in inch sizing.
What does 265/65R18 mean?
265 mm section width, sidewall 65% of the width (6.78"), radial construction, 18-inch rim.
What tire sizes are equivalent to 265/65R18?
On the same 18" rim, within 3% of the diameter: 245/70R18 (-0.19%), 285/60R18 (-0.31%), 255/70R18 (+1.56%), 255/65R18 (-1.62%), 275/65R18 (+1.62%), 275/60R18 (-1.81%).
How many revolutions per mile does a 265/65R18 tire make?
About 639 revolutions per mile (circumference 99.2").
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.