The rim ratio indicates how broad a rim is relative to the overall diameter. It's calculated as: 2 x rim width ÷ overall diameter, expressed as a percentage.
In simpler terms, the rim ratio describes the proportion of a wheel's diameter that the rim occupies. A "normal" rim ratio is generally considered to be between 21% and 32%. A higher percentage means the rim is wider relative to the overall diameter of the wheel.
Here's a breakdown:
- Rim Width: The distance from one side of the rim to the other, internally.
- Overall Diameter: The total diameter of the wheel, including the rim.
- Rim Ratio = (2 x Rim Width / Overall Diameter) x 100%
Example:
Let's say a wheel has a rim width of 5 inches and an overall diameter of 20 inches.
Rim Ratio = (2 x 5 inches / 20 inches) x 100% = 50%
In this case, the rim ratio is 50%, indicating a relatively wide rim for that wheel diameter.
