The "profile" on a tire is essentially another term for its sidewall height.
The tire's profile, or sidewall, is the vertical section of the tire between the wheel rim and the top of the tread. This height is directly related to a number found on the tire's sidewall: the aspect ratio.
Understanding Tire Profile and Aspect Ratio
The reference states that the aspect ratio indicates the height of the sidewall, or "profile," and is expressed as a percentage. It's calculated as the height of the sidewall measured from the wheel rim to the top of the tread, shown as a percentage of the tire's width.
- Higher Aspect Ratio: According to the reference, "The bigger the aspect ratio, the higher/taller the tire's sidewall, or 'profile' as it's sometimes called." This means a tire with a higher aspect ratio has a taller profile.
- Lower Aspect Ratio: A tire with a lower aspect ratio has a shorter, or "low," profile.
Where to Find the Profile (Aspect Ratio)
You can find the aspect ratio as part of the series of numbers and letters on the tire's sidewall. For example, in a tire size designation like P205/55R16:
P: Indicates passenger car tire.205: Represents the tire's width in millimeters.55: This is the aspect ratio. It means the sidewall height is 55% of the tire's width (205 mm).R: Indicates radial construction.16: Represents the wheel diameter in inches.
So, in this example, the number 55 directly relates to the tire's profile or sidewall height.
Practical Implications of Tire Profile
The profile (sidewall height) significantly impacts a tire's performance and ride characteristics:
- High Profile Tires (Higher Aspect Ratio):
- Offer a more comfortable ride due to more cushion.
- Often found on sedans, SUVs, and off-road vehicles.
- Provide better handling on uneven surfaces.
- Low Profile Tires (Lower Aspect Ratio):
- Provide sharper handling and better steering response.
- Often found on sports cars and performance vehicles.
- Can result in a harsher ride as there is less sidewall to absorb impacts.
- More susceptible to damage from potholes or road debris.
Understanding the tire profile, indicated by the aspect ratio, helps drivers choose tires that match their vehicle type and driving preferences.
