From Mugen:
Compared to the standard springs, by improving the road holding, which improves steering and stability, and reduces posture disturbance due to bumpy road surface. By using A2540 (7.0P) for the front and A2539 (6.5P) for the rear, the car rolls more smoothly, the accuracy of line taking at the corner entrance is increased, and it is possible to turn with a smaller R. A2540 (7.0P) can be used for both front and rear at the small tracks or with slow motors.
#A2539 – Progressive Shock Spring 6.5T
#A2540 – Progressive Shock Spring 7.0T
#A2541 – Progressive Shock Spring 6.75T
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