Cause of understeer
1. Unbalanced car body mass distribution: Balanced car body mass distribution should be 50:50 before and after. If the front part of the car body is larger than the rear part (quality allocation >50:50, such as 60:40), the vehicle will behave as a turn. Insufficient. If the front part of the car body is smaller than the rear part (quality allocation <50:50, such as 40:60), the vehicle will be over-steered;
2. Excessive front suspension hardness (including spring stiffness, shock absorber hardness, anti-roll bar hardness);
3, too low rear suspension hardness (including roll stiffness, shock absorber hardness, anti-roll bar hardness);
4. The front roll point is too high relative to the rear roll point;
5. The roll center is too low relative to the front roll point;
6. The width of the rear wheel is too wide (track, the distance from the center line of the left rear wheel to the center line of the right rear wheel);
7. The width of the rear tire that is too wide (the width of the contact surface between the tire and the ground).