Check the listing for details. Progressive Fork Springs 11-1129. Condition: New. Listed at 106.92 USD. Genuine Progressive Suspension Products: Founded in 1982, Progressive Suspension is the premier US motorcycle & ATV suspension manufacturer. Product Details: The original progressive rate fork springs soak up the small road bumps for a plush ride, yet are firm enough to absorb the molar-rattling ones. Spring rates have been chosen to reduce front-end dive during braking, yet still provide excellent ride comfort. Progressive Rate Fork Springs have a rising rate of resistance to compression to give you a more comfortable ride than straight rate springs. Manufacturer's lifetime warranty About Us: LeClare Powersports is a small-town Parts and Accessories store in Springfield, MO. Our low overhead allows us to offer better prices than the 'Big Boys', but our owner-operated store allows us to give our customers the great customer service they deserve. We only sell brand new, high quality GENUINE name-brand aftermarket parts...no junk, no knock offs and no "seconds". Buy with confidence!