Tire Size 30×9.50r15 To Metric
The 30×9.50R15 tire is typically expressed in inches, making it a challenge to translate into metric measurements. This article will guide you through the process of understanding and converting these measurements. In short, the metric equivalent for a 30×9.50R15 tire we calculated is 241/79R15.
Understanding The Measurements
The 30×9.50R15 tire size is a popular choice for Jeep Wranglers and other off-road vehicles. It offers a good balance of on-road performance and off-road traction. The tire size you provided, “30×9 50r15,” is typically read as 30×9.50R15 in the US. This is already a metric measurement, but it’s a mix of metric and imperial standards, which may make it confusing.
Breaking it Down
- 30 represents the diameter of the tire in inches.
- 9.50 is the width of the tire in inches.
- R stands for radial construction.
- 15 is the diameter of the wheel that the tire fits onto in inches.
30×9.5R15 in inches
To better comprehend the breakdown of tire features and metrics, the following table provides a comprehensive overview.
| Parameter | Measurement |
|---|---|
| Tire Height | 30.0″ |
| Section Width | 9.5″ |
| Rim Width Range | 6.5-8.5″ |
| Rim Size | 15″ |
| Sidewall Height | 7.5″ |
| Circumference | 94.2″ |
| Revs/Mile | 673 |
Conversion Process
Converting a tire size from inches to metric (millimeters) helps to understand what each number and letter in the tire size means. Now, let’s convert each of these measurements to metric.
- Overall Diameter: The overall diameter is 30 inches. Since 1 inch is approximately 25.4mm, we multiply 30 by 25.4 to get the overall diameter in millimeters. So, 30 inches x 25.4 = 762mm.
- Width: The width of the tire is 9.50 inches. Again, to convert inches to millimeters, we multiply 9.50 by 25.4. So, 9.50 inches x 25.4 = 241.3mm.
- Wheel Diameter: The wheel diameter is 15 inches. Multiplying by 25.4, 15 inches x 25.4 = 381mm.
The Aspect Ratio and Sidewall Height are not directly provided in the given size, but we can calculate them. The Aspect Ratio is the ratio of the height of the tire’s cross-section to its width, expressed as a percentage. The Sidewall Height is the tire’s height from the rim to the tread.
Since we’re given the overall diameter and the rim diameter, we can calculate the Sidewall Height:
- Sidewall Height = (Overall Diameter – Rim Diameter) / 2 = (30 – 15) / 2 = 7.5 inches, which is approximately 190.5mm (7.5 x 25.4).
The Aspect Ratio can then be calculated as:
- Aspect Ratio = (Sidewall Height / Width) * 100% = (7.5 / 9.50) * 100% = approximately 79%.
So, the metric equivalent of a 30×9.50R15 tire is approximately a 762/241R381 tire. However, this size may not be readily available in the market since it is not a standard metric tire size.
Metric tire sizes are rounded to the nearest 5 millimeters for width and the nearest whole number for the aspect ratio. So, a 30×9.50r15 tire size in metric would be approximately 245/75r15.
Replacement Tire Size
It is imperative to select replacement tires with an overall diameter that falls within a 3% range of the 30×9.50R15 tire size.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 295/60R15 | 28.9″ (735 mm) | -1.9% |
| 225/80R15 | 29.2″ (741 mm) | -1.1% |
| 215/85R15 | 29.4″ (747 mm) | -0.3% |
| 205/90R15 | 29.6″ (751 mm) | 0.3% |
| 265/70R15 | 29.6″ (753 mm) | 0.5% |
| 235/80R15 | 29.8″ (757 mm) | 1.1% |
| 315/60R15 | 29.9″ (759 mm) | 1.3% |
| 345/55R15 | 30″ (761 mm) | 1.6% |
| 255/75R15 | 30″ (763 mm) | 1.9% |
| 275/70R15 | 30.2″ (767 mm) | 2.4% |
| 325/60R15 | 30.4″ (771 mm) | 2.9% |
How Tall Are 30×9.50r15?
The “30×9.50R15” is a tire size common for off-road and 4×4 vehicles. The “30” refers to the overall diameter of the tire in inches, which is approximately its height when mounted on a wheel and not under load.
So a 30×9.50R15 tire is approximately 30 inches tall. This can vary slightly between different tire models and manufacturers due to different tread designs and tire constructions, but the difference is typically small.
Remember that the “9.50” refers to the section width of the tire or the width of the tire from sidewall to sidewall in inches. The “15” refers to the wheel diameter the tire is designed to fit in inches.
How Wide Is A 33×12.50r20 Tire?
The “12.50” in this size indicates the width of the tire. Therefore, a 33×12.50R20 tire is approximately 12.50 inches wide. This measurement is the width from one sidewall of the tire to the other, also known as the section width.
However, actual tire dimensions can vary slightly between different tire models and manufacturers due to different tread designs and tire constructions.
What Size Rim Fits A 33×12.50r20?
The “33×12.50R20” tire size is designed to fit a 20-inch diameter wheel or rim. As for the rim width, while it can depend on the specific tire model and the manufacturer’s recommendations, generally, a 33×12.50R20 tire can be mounted on rims with widths ranging from 8.5 to 11 inches.
The most common width used for this tire size is around 9 to 10 inches. However, it’s always important to consult the tire manufacturer’s specifications or a tire professional to ensure proper fitment.
Meet Caitlin McCormack, a Tire Size Expert and Blogger Passionate About Everything Related to Tires. With Years of Experience in the Tire Industry, Caitlin Has Become an Expert in Tire Sizes and Their Impact on Vehicle Performance.