205/55R16 Tire Size
A 205/55R16 tire has a nominal calculated diameter of approximately 24.88 inches (631.9 mm), a nominal section width of about 8.07 inches (205 mm), and a sidewall height of about 4.44 inches (112.8 mm).
205/55R16 in Inches
When converted to US customary units, a nominal 205/55R16 tire measures approximately 24.88 inches in overall height with a section width of 8.07 inches mounted on a 16-inch wheel.
Note: The dimension 24.9" × 8.1" R16 is an approximate nominal descriptive conversion, not a physical flotation catalog tire designation.
205/55R16 Dimensions Table
The table below summarizes all derived nominal geometric parameters for the 205/55R16 size in both US customary and metric units.
| Measurement Parameter | Inches (US) | Millimeters (Metric) |
|---|---|---|
| Nominal Section Width | 8.07 in | 205 mm |
| Sidewall Height (55%) | 4.44 in | 112.8 mm |
| Wheel (Rim) Diameter | 16.00 in | 406.4 mm |
| Nominal Overall Diameter (Height) | 24.88 in | 631.9 mm |
| Nominal Radius | 12.44 in | 315.9 mm |
| Nominal Circumference | 78.16 in | 1985.2 mm |
| Theoretical Revolutions | 811 revs/mile | 504 revs/km |
What Does 205/55R16 Mean?
The markings on the sidewall of a 205/55R16 tire represent standard ISO metric dimensions:
The 205 indicates a nominal section width of 205 millimeters (approximately 8.07 inches).
The sidewall height is 55% of the nominal section width, measuring 112.8 mm (4.44 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 16 inches (406.4 mm).
205/55R16 Dimensional Context & Proportions
205/55R16 has a nominal calculated diameter of 24.88 inches, placing it about 0.12 inches below a nominal 25-inch diameter.
Its 55-series aspect ratio means the nominal sidewall height is 55% of the 205 mm section width, giving a calculated sidewall height of 112.8 mm (4.44 in).
The 205 in 205/55R16 represents a nominal section width of 205 mm, which converts to approximately 8.07 inches.
Compare 205/55R16 With Another Tire Size
Nearby 16-Inch Tire Sizes by Nominal Diameter
The table below lists alternative standard tire sizes mounted on 16-inch wheels that fall within a ±3.0% nominal diameter window relative to 205/55R16.
| Nearby Size | Diameter | Diameter Delta | Width Delta | Sidewall Delta |
|---|---|---|---|---|
| 205/55R16Current | 24.88" | Baseline (0.0%) | 8.07" | 4.44" |
| 195/55R16 | 24.44" | -0.43" (-1.7%) | -0.39" | -0.22" |
| 225/50R16 | 24.86" | -0.02" (-0.1%) | +0.79" | -0.01" |
| 215/55R16 | 25.31" | +0.43" (+1.7%) | +0.39" | +0.22" |
±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 205/55R16 Tires
How tall is a 205/55R16 tire?
A nominal 205/55R16 tire has an overall calculated diameter (height) of 24.88 inches (631.9 mm). Physical mounted height can vary slightly between tire manufacturers, tread depths, and inflation pressures.
How wide is a 205/55R16 tire in inches?
A 205/55R16 tire has a nominal section width of 205 mm, which converts to approximately 8.07 inches. Actual mounted cross-section width can vary depending on wheel rim width, tire model, and manufacturing tolerances.
Is 205/55R16 considered a 25-inch tire?
In casual automotive reference sizing, a 205/55R16 tire (nominal diameter of 24.88 inches) is generally grouped within the "25-inch" nominal diameter category.
What is the sidewall height of a 205/55R16 tire?
The sidewall height of a 205/55R16 tire is 4.44 inches (112.8 mm). This is calculated by taking 55% of the 205 mm section width.
How many revolutions per mile does a 205/55R16 tire make?
A nominal 205/55R16 tire makes approximately 811 revolutions per mile (504 revolutions per kilometer).
Content is based on cited tire-industry standards, manufacturer documentation, and technical references where relevant.