285/60R18 — a dead heat with a light-truck 17
Two codes, one inch of wheel between them, and no measurable difference in how far either rolls.
Metric notation · Light truck (LT-metric)
- Overall diameter
- 31.46 in
- 799 mm
- Section width
- 11.22 in
- 285 mm
- Sidewall height
- 6.73 in
- 171 mm
- Aspect ratio
- 60%
- sidewall as a share of width
- Wheel diameter
- 18 in
- the hole in the middle
- Circumference
- 98.8 in
- 2511 mm
- Revolutions per mile
- 641.0
- geometric, not measured
- Revolutions per km
- 398.3
- geometric, not measured
- Typical load index
- 108–129
- 2205–4079 lb per tire
LT-metric tires use a stiffer casing at a much higher reference inflation — Load Range C, D or E, meaning 50, 65 or 80 psi. The index band reflects the pressure the casing is rated to hold, not a larger tire.
The load-index range shown is the band this CLASS of size is typically produced in — not a list of what is in stock for this exact size today. Load index and speed symbol are printed on the sidewall of the specific tire you are holding, and the required minimum is on the placard of the specific vehicle you are fitting. Read both.
Nearest real sizes in imperial notation, same wheel
- 33x12.50R1833.00 in tall+1.54 in
- 35x12.50R1835.00 in tall+3.54 in
- 37x12.50R1837.00 in tall+5.54 in
Compare any two sizes, including ones this site has no page for, in the comparison tool.
Platforms recorded with this size
The 200-Series Toyota Land Cruiser is the vehicle recorded here with 285/60R18 as factory equipment — a wide, comparatively short light-truck size on a wheel that most of its competitors were using for something narrower.
The tie
245/75R17 measures 31.47 in. This size measures 31.46 in. Carried to two decimal places the gap is 0.00 in — 0.01% — which is the closest agreement between any two codes in this catalogue that do not share a wheel diameter.
Everything else about them is different. This tire is 11.22 in wide with 6.73 in of casing above the rim; the 17-inch code is 9.65 in wide with 7.23 in. One is specified for a heavy full-size SUV on an 18-inch alloy, the other for pickups and utility vehicles that were still being delivered on 17s.
A vehicle moving between the two would see no change on the speedometer, no change on the odometer, no change in engine speed at a given road speed and no change in ride height. It would gain or lose 1.57 in of section width, which is the only thing actually happening.
Its own wheel, by height
| Size | Diameter | Against 285/60R18 | Section width |
|---|---|---|---|
| 255/60R18 | 30.05 in | −1.42 in | 10.04 in |
| 265/60R18 | 30.52 in | −0.94 in | 10.43 in |
| 285/60R18 | 31.46 in | — | 11.22 in |
| 265/65R18 | 31.56 in | +0.10 in | 10.43 in |
| 255/70R18 | 32.06 in | +0.59 in | 10.04 in |
| 275/65R18 | 32.07 in | +0.61 in | 10.83 in |
The fourth row is the useful one. 265/65R18 is a tenth of an inch taller on a casing 0.79 in narrower — near enough the same tire in every respect the arithmetic can reach, and visibly different on the vehicle.
Reaching upward from here
The next rung in the same width is 285/65R18 at 32.59 in: +1.12 in and 3.57%, an indicated 70 mph becoming an actual 72.5 mph. Above that, 33x12.50R18 stands 33.00 in, +1.54 in and 4.88%, and adds 1.28 in of section width along with the height.
The step to 285/65R18 is set out in detail in the comparison of the two.
Related
- 285/60R18 vs 285/65R18
- 33x12.50R1833.00 in tall
- 35x12.50R1835.00 in tall
- 37x12.50R1837.00 in tall
Class: Light truck (LT-metric). Every figure above is computed from the size code, not stored — see how these numbers are calculated.