Bump steer matters because suspension movement can change a wheel’s steering position. As one wheel rises or falls, the steering geometry can make that wheel toe in or toe out, causing the vehicle to turn without driver input. [1]

Excessive bump steer increases tyre wear and makes the vehicle harder to handle, especially on rough roads.

Calculating the amount of bump steer and working out how to correct it can be a long, difficult process, but the calculator takes on the hard work and reports back to you (in real time) how well your design resists the urge to bump steer.

Instructions

To activate steering and bump steer analysis:

1. Open the Suspension Geometry Calculator or the Macpherson Geometry Calculator.
2. Click “Toggle steering arms”.
3. Position the steering arms by dragging them, or use Edit > Form Input > Dimensions from vehicle.
4. Tick “Steering” if needed.
5. Enter the steering knuckle positions.
6. Click the RC button.
7. View the bump steer score and inline visualisation.

When the RC button is enabled, the calculator tests the amount of bump steer across the suspension’s travel. The suspension travel is defined when you select the intended use: Race, road, or off-road.

1. A bump steer score in the scorecards at the bottom of the screen.
2. An inline visualisation showing the score and the amount of bump steer across the range of travel below each wheel.

Citations

1. https://www.racingaspirations.com/bump-steer/

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Bump steer analysis

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