265/65R18 tire size
265/65R18 (listed here under light-truck & off-road sizes) is 31.56 in tall and 10.43 in wide, with a 6.78 in sidewall, and is made for an 18-inch wheel.
| Measurement | Imperial | Metric |
|---|---|---|
| Overall diameter (height) | 31.56 in | 802 mm |
| Section width | 10.43 in | 265 mm |
| Sidewall height | 6.78 in | 172 mm |
| Rim (wheel) diameter | 18 in | 457 mm |
| Aspect ratio | 65% | — |
| Circumference | 99.2 in | 2519 mm |
| Revolutions | 639 per mile | 397 per km |
Compare 265/65R18 with any other size →
265/65R18 in inches
265/65R18 is 31.56 × 10.43 in on an 18-inch rim — roughly 31.5x10.50R18 in inch (flotation) terms.
Other metric sizes on an 18-inch rim within ±3% of its diameter:
| Size | Diameter | Width | vs original |
|---|---|---|---|
| 245/70R18 | 31.50 in | 9.65 in | −0.19% |
| 285/60R18 | 31.46 in | 11.22 in | −0.31% |
| 225/75R18 | 31.29 in | 8.86 in | −0.87% |
| 235/75R18 | 31.88 in | 9.25 in | +1.00% |
| 295/60R18 | 31.94 in | 11.61 in | +1.18% |
| 305/55R18 | 31.21 in | 12.01 in | −1.12% |
| 255/70R18 | 32.06 in | 10.04 in | +1.56% |
| 275/65R18 | 32.07 in | 10.83 in | +1.62% |
| 255/65R18 | 31.05 in | 10.04 in | −1.62% |
| 275/60R18 | 30.99 in | 10.83 in | −1.81% |
Computed combinations of standard widths and aspect ratios; not every size is manufactured. A similar diameter does not mean a size fits or is approved for your vehicle.
Sizes on other wheels with nearly the same height
From our size pages, these stay within ±3% of 265/65R18's diameter:
Height difference to other sizes on this site
| Other size | Height difference | True speed at 60 mph indicated | Diameter vs ±3% rule of thumb |
|---|---|---|---|
| 265/70R17 | +0.04 in (+0.1%) | 60.1 mph | inside |
| 265/75R16 | +0.09 in (+0.3%) | 60.2 mph | inside |
| 275/65R18 | +0.51 in (+1.6%) | 61.0 mph | inside |
| 265/75R15 | −0.91 in (−2.9%) | 58.3 mph | inside |
| 265/70R16 | −0.96 in (−3.0%) | 58.2 mph | outside |
| 245/75R16 | −1.09 in (−3.5%) | 57.9 mph | outside |
Speeds assume the speedometer was accurate on 265/65R18.
Geometry only: this does not confirm that a size fits, is approved for or is safe on a particular vehicle. Wheel width and offset, suspension, clearances, load index, speed rating, the vehicle maker's specification and local regulations all apply — check with your owner's manual and a qualified tire professional.
Detailed comparisons
Frequently asked questions
How tall is a 265/65R18 tire?
31.56 inches (802 mm) in nominal overall diameter. Measured height varies slightly by brand and model and decreases as the tread wears.
What is 265/65R18 in inches?
About 31.6 × 10.4 in on an 18-inch wheel, which in inch (flotation) notation is roughly 31.5x10.50R18.
How tall is 265/65R18 in whole inches?
31.56 in, which rounds to 32 in. Tire sellers and owners sometimes round sizes differently, and measured heights vary by model.
How many revolutions per mile does a 265/65R18 make?
About 639 revolutions per mile (397 per km) from its nominal circumference of 99.2 in. Manufacturer-measured values are slightly higher because the loaded tire deflects.
Nominal dimensions computed from the size code; see methodology. Always confirm load index, speed rating and fitment for your vehicle.
Related tools
- Tire size comparison
Two sizes side by side, to scale, with speedometer and RPM tables.
- Speedometer error calculator
How fast you are really going after a tire change.
- Plus size calculator
Sizes that keep your diameter on a bigger or smaller wheel.
- Tire size chart
Common sizes by wheel diameter with heights and widths.