Is the black coated springs from Stage6 are available in different strengths . If you notice changes in your actions that the belt starts to slip , you'll need a stronger torque spring . Most notices it because the engine runs great, but does not use acceleration . The strength of the respective torque spring is marked on the spring itself , and thus easier to distinguish Dimensions:. 4.3 x 58.1 mm Comparison numbers: Neu & Originalverpackt.