Cane Creek Progressive Rate VALT Lightweight Rear Shock Spring - 45mm x 500-610lbs WhiteCane Creek Progressive Rate VALT Lightweight Rear Shock Spring 45mm x 500 610lbs White. Cane Creek Progressive Rate VALT coil springs are designed to provide riders with a true rise in rate spring curve. Springs feature the progressiveness and ramp up that hard charging riders demand Designed for use with Cane Creek Coil shocks Progression begins at 50% into the stroke of the spring Crafted from high performance spring steel Inner diameter of 36. 5mm