285/70R17 Tire Size
A 285/70R17 tire has a nominal calculated diameter of approximately 32.71 inches (830.8 mm), a nominal section width of about 11.22 inches (285 mm), and a sidewall height of about 7.85 inches (199.5 mm).
285/70R17 in Inches
When converted to US customary units, a nominal 285/70R17 tire measures approximately 32.71 inches in overall height with a section width of 11.22 inches mounted on a 17-inch wheel.
Note: The dimension 32.7" × 11.2" R17 is an approximate nominal descriptive conversion, not a physical flotation catalog tire designation.
285/70R17 Dimensions Table
The table below summarizes all derived nominal geometric parameters for the 285/70R17 size in both US customary and metric units.
| Measurement Parameter | Inches (US) | Millimeters (Metric) |
|---|---|---|
| Nominal Section Width | 11.22 in | 285 mm |
| Sidewall Height (70%) | 7.85 in | 199.5 mm |
| Wheel (Rim) Diameter | 17.00 in | 431.8 mm |
| Nominal Overall Diameter (Height) | 32.71 in | 830.8 mm |
| Nominal Radius | 16.35 in | 415.4 mm |
| Nominal Circumference | 102.76 in | 2610.0 mm |
| Theoretical Revolutions | 617 revs/mile | 383 revs/km |
What Does 285/70R17 Mean?
The markings on the sidewall of a 285/70R17 tire represent standard ISO metric dimensions:
The 285 indicates a nominal section width of 285 millimeters (approximately 11.22 inches).
The sidewall height is 70% of the nominal section width, measuring 199.5 mm (7.85 inches).
R indicates radial construction, where the main carcass cords run approximately radially from bead to bead.
Designed to fit a wheel (rim) with a diameter of 17 inches (431.8 mm).
285/70R17 Dimensional Context & Proportions
285/70R17 has a nominal calculated diameter of 32.71 inches, placing it about 0.29 inches below a nominal 33-inch diameter.
Its 70-series aspect ratio means the nominal sidewall height is 70% of the 285 mm section width, giving a calculated sidewall height of 199.5 mm (7.85 in).
The 285 in 285/70R17 represents a nominal section width of 285 mm, which converts to approximately 11.22 inches.
Compare 285/70R17 With Another Tire Size
Nearby 17-Inch Tire Sizes by Nominal Diameter
The table below lists alternative standard tire sizes mounted on 17-inch wheels that fall within a ±3.0% nominal diameter window relative to 285/70R17.
| Nearby Size | Diameter | Diameter Delta | Width Delta | Sidewall Delta |
|---|---|---|---|---|
| 285/70R17Current | 32.71" | Baseline (0.0%) | 11.22" | 7.85" |
| 235/80R17 | 31.80" | -0.91" (-2.8%) | -1.97" | -0.45" |
| 255/75R17 | 32.06" | -0.65" (-2.0%) | -1.18" | -0.32" |
| 275/70R17 | 32.16" | -0.55" (-1.7%) | -0.39" | -0.28" |
| 305/65R17 | 32.61" | -0.10" (-0.3%) | +0.79" | -0.05" |
| 295/70R17 | 33.26" | +0.55" (+1.7%) | +0.39" | +0.28" |
±3.0% is used only as a configurable discovery window for identifying dimensionally nearby sizes. It is not a safety limit, compatibility threshold, replacement recommendation, or vehicle-fitment approval.
Nominal vs Actual Tire Dimensions
The dimensions listed on this reference page are nominal calculated figures derived from standard tire-size geometry. Tire-industry standards and manufacturer specifications are referenced where relevant.
Actual mounted dimensions can vary by tire manufacturer and model, tread design, measuring rim width, production tolerances, tread wear, and test or operating conditions. Consult the tire manufacturer’s published specifications when measured dimensions are required.
Technical Boundaries & Fitment Verification
Changing tire specifications may require separate load-capacity and cold inflation pressure verification. Dimensional size alone does not determine vehicle load class, speed rating, or approved wheel-width ranges.
Frequently Asked Questions About 285/70R17 Tires
How tall is a 285/70R17 tire?
A nominal 285/70R17 tire has an overall calculated diameter (height) of 32.71 inches (830.8 mm). Physical mounted height can vary slightly between tire manufacturers, tread depths, and inflation pressures.
How wide is a 285/70R17 tire in inches?
A 285/70R17 tire has a nominal section width of 285 mm, which converts to approximately 11.22 inches. Actual mounted cross-section width can vary depending on wheel rim width, tire model, and manufacturing tolerances.
Is 285/70R17 considered a 33-inch tire?
In casual automotive reference sizing, a 285/70R17 tire (nominal diameter of 32.71 inches) is generally grouped within the "33-inch" nominal diameter category.
What is the sidewall height of a 285/70R17 tire?
The sidewall height of a 285/70R17 tire is 7.85 inches (199.5 mm). This is calculated by taking 70% of the 285 mm section width.
How many revolutions per mile does a 285/70R17 tire make?
A nominal 285/70R17 tire makes approximately 617 revolutions per mile (383 revolutions per kilometer).
Content is based on cited tire-industry standards, manufacturer documentation, and technical references where relevant.