* Progressive-Rate VALT springs maintain the sensitivity and set it and forget it mentality of a traditional coil set up, but with the progressiveness and ramp up that hard-charging riders and many frame designs demand.* Progression begins at 50% into the stroke of the spring.* Inner diameter: 36.5mm* Outer diameter: 52.5-54mm* Can be used with Fox use by using the Cane Creek to Fox spring adaptor