235/75R15 Tire Size
A 235/75R15 tire has a nominal calculated diameter of approximately 28.88 inches (733.5 mm), a nominal section width of about 9.25 inches (235 mm), and a sidewall height of about 6.94 inches (176.3 mm).
235/75R15 in Inches
When converted to US customary units, a nominal 235/75R15 tire measures approximately 28.88 inches in overall height with a section width of 9.25 inches mounted on a 15-inch wheel.
Note: The dimension 28.9" × 9.3" R15 is an approximate nominal descriptive conversion, not a physical flotation catalog tire designation.
235/75R15 Dimensions Table
The table below summarizes all derived nominal geometric parameters for the 235/75R15 size in both US customary and metric units.
| Measurement Parameter | Inches (US) | Millimeters (Metric) |
|---|---|---|
| Nominal Section Width | 9.25 in | 235 mm |
| Sidewall Height (75%) | 6.94 in | 176.3 mm |
| Wheel (Rim) Diameter | 15.00 in | 381.0 mm |
| Nominal Overall Diameter (Height) | 28.88 in | 733.5 mm |
| Nominal Radius | 14.44 in | 366.7 mm |
| Nominal Circumference | 90.72 in | 2304.4 mm |
| Theoretical Revolutions | 698 revs/mile | 434 revs/km |
What Does 235/75R15 Mean?
The markings on the sidewall of a 235/75R15 tire represent standard ISO metric dimensions:
The 235 indicates a nominal section width of 235 millimeters (approximately 9.25 inches).
The sidewall height is 75% of the nominal section width, measuring 176.3 mm (6.94 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 15 inches (381.0 mm).
235/75R15 Dimensional Context & Proportions
235/75R15 has a nominal calculated diameter of 28.88 inches, placing it about 0.12 inches below a nominal 29-inch diameter.
Its 75-series aspect ratio means the nominal sidewall height is 75% of the 235 mm section width, giving a calculated sidewall height of 176.3 mm (6.94 in).
The 235 in 235/75R15 represents a nominal section width of 235 mm, which converts to approximately 9.25 inches.
Compare 235/75R15 With Another Tire Size
Nearby 15-Inch Tire Sizes by Nominal Diameter
The table below lists alternative standard tire sizes mounted on 15-inch wheels that fall within a ±3.0% nominal diameter window relative to 235/75R15.
| Nearby Size | Diameter | Diameter Delta | Width Delta | Sidewall Delta |
|---|---|---|---|---|
| 235/75R15Current | 28.88" | Baseline (0.0%) | 9.25" | 6.94" |
| 225/75R15 | 28.29" | -0.59" (-2.0%) | -0.39" | -0.30" |
±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 235/75R15 Tires
How tall is a 235/75R15 tire?
A nominal 235/75R15 tire has an overall calculated diameter (height) of 28.88 inches (733.5 mm). Physical mounted height can vary slightly between tire manufacturers, tread depths, and inflation pressures.
How wide is a 235/75R15 tire in inches?
A 235/75R15 tire has a nominal section width of 235 mm, which converts to approximately 9.25 inches. Actual mounted cross-section width can vary depending on wheel rim width, tire model, and manufacturing tolerances.
Is 235/75R15 considered a 29-inch tire?
In casual automotive reference sizing, a 235/75R15 tire (nominal diameter of 28.88 inches) is generally grouped within the "29-inch" nominal diameter category.
What is the sidewall height of a 235/75R15 tire?
The sidewall height of a 235/75R15 tire is 6.94 inches (176.3 mm). This is calculated by taking 75% of the 235 mm section width.
How many revolutions per mile does a 235/75R15 tire make?
A nominal 235/75R15 tire makes approximately 698 revolutions per mile (434 revolutions per kilometer).
Content is based on cited tire-industry standards, manufacturer documentation, and technical references where relevant.