-20 mm Lowering Rear Shock Spring Spring Color:Black Newly engineered for IDM Superbike

Newly engineered for IDM Superbike use

a slightly stiffer spring combined with optimized rebound and compression damping yields a wider adjustment range than the original shock

progressive fork springs are installed from the factory

The model-specific components are precision-milled from aluminum or corrosion-protected steel

race-winning performance without ruining your bike's period-correct look

-20 mm Lowering Rear Shock Spring Spring Color:Black Newly engineered for IDM SuperbikeThe Progressive Lowering Rear Spring is designed to lower the bike while enhancing ride quality. It fits onto the original shock, offering a straightforward upgrade for improved comfort and performance.