Rear Ride Rate Calculator

Rear Ride Rate Formula:

\[ Kr = \frac{\Delta Wro \times [g]}{x2} \]

Rear Ride Rate (Kr):

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1. What is Rear Ride Rate?

Rear Ride Rate is defined as vertical force per unit vertical displacement of the tire ground contact with respect to chassis. It represents the stiffness of the rear suspension system and affects the vehicle's handling characteristics and ride comfort.

2. How Does the Calculator Work?

The calculator uses the Rear Ride Rate formula:

\[ Kr = \frac{\Delta Wro \times [g]}{x2} \]

Where:

\( Kr \) — Rear Ride Rate (N/m)
\( \Delta Wro \) — Rear Outside Wheel Change (kg)
\( [g] \) — Gravitational acceleration constant (9.80665 m/s²)
\( x2 \) — Rear Bump Allowance (m)

Explanation: The formula calculates the rear suspension stiffness by relating the change in wheel load during cornering to the vertical displacement allowed by the suspension system.

3. Importance of Rear Ride Rate Calculation

Details: Accurate rear ride rate calculation is crucial for optimizing vehicle handling, stability, and ride comfort. It helps in tuning suspension systems for different driving conditions and vehicle applications.

4. Using the Calculator

Tips: Enter Rear Outside Wheel Change in kilograms and Rear Bump Allowance in meters. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is Rear Outside Wheel Change?
A: Rear Outside Wheel Change is the difference between the load on the rear outside wheel during cornering and the load during straight path travel.

Q2: What is Rear Bump Allowance?
A: Rear Bump Allowance refers to the vertical movement of the spring when the vehicle encounters a full bump.

Q3: Why is gravitational acceleration used in the formula?
A: Gravitational acceleration converts mass (kg) to force (N) using Newton's second law (F = m × g).

Q4: How does rear ride rate affect vehicle performance?
A: Higher rear ride rates provide better handling and stability but may reduce ride comfort, while lower rates offer better comfort but may compromise handling.

Q5: What are typical values for rear ride rate?
A: Typical values vary by vehicle type and application, ranging from 20,000-50,000 N/m for passenger cars to higher values for performance and racing vehicles.