Calculate wheel rate from spring rate and motion ratio, including installation angle and helper springs, plus ride frequency from corner weight.
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Wheel Rate Formula
The following two example problems outline the steps and information needed to calculate the Wheel Rate.
WR = K * M^2
- Where WR is the Wheel Rate (e.g., lbf/in, N/m)
- K is the spring rate (same force/length units as WR)
- M is the motion ratio (spring/shock travel ÷ wheel travel, dimensionless)
To calculate the wheel rate, multiply the spring rate by the motion ratio squared (with motion ratio defined as spring/shock travel ÷ wheel travel).
How to Calculate Wheel Rate?
The following example problems outline how to calculate Wheel Rate.
Example Problem #1:
- First, determine the spring constant (lbf/in).
- The spring constant (lbf/in) is given as: 400.
- Next, determine the motion ratio (dimensionless).
- The motion ratio (spring/shock travel ÷ wheel travel) is provided as: 0.80.
- Finally, calculate the Wheel Rate using the equation above:
WR = K * M^2
The values provided above are inserted into the equation below and computed.
WR = 400 * 0.80^2 = 256.00 (lbf/in)
Example Problem #2:
For this problem, the variables required are provided below:
spring constant (lbf/in) = 550
motion ratio (spring/shock travel ÷ wheel travel, dimensionless) = 0.70
Test your knowledge using the equation and check your answer with the calculator.
WR = K * M^2 = ?
