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The Power Tube will be adjusted by a plastic ”disc” on the back of the spring. By turning the disc, the skier will adjust the tension of the spring. The disc/Power Tube can be adjusted either by hand or with a screwdriver.
Rottefella originally made 4 stiffnesses of Power Tubes but now only make the Soft (Green) and Medium (Blue) stiffnesses. The red (stiff) and white (extra-soft) are no longer manufactured.
Size: 95 mm, 110 mm Spring Stiffness/Colour: Soft-Green