Cane Creek VALT springs offer a significant weight reduction over standard steel springs. Inner diameter of 36.5mm (1.43") is compatible with all Cane Creek coil shocks Also compatible with Manitou, old Marzocchi, X-Fusion, ELKA, MRP, BOS, Ohlins and most Fox models. Compatible with Fox DHX and DHX2 Fox VAN RC and Marzocchi Bomber CR will require (2) spring clip adaptors. Not compatible with RockShox shocks. Standard linear spring rate. Also available in progressive spring rates: Cane Creek Valt Progressive Spring The maximum stroke is used for proper sizing on your coil shock. You will purchase the max stroke which is closest to your shock&';s stroke, but also longer. For example, if you have a 210x55 rear shock, the stroke is 55mm and you will order this spring in 57mm max stroke. Free Length Measurements (total length when uncompressed): { "__shgImageV2Elements": { "uuid": "s-8bb11b61-6d1f-4158-9844-9d3ffcce0f4c" } }