Standard Conventional Progressive Spring - 20" Length | 5" OD | 225lbs/inch 5.5" OD *Image example is a 700lbs/inch

*Image example is a 700lbs/inch spring rate

Part Number: 080-188-050

Part Number: 100-188-300 B3

Spring Rate : 3000lbs/inch

Spring Rate : 75/150lbs/inch

Standard Conventional Progressive Spring - 20" Length | 5" OD | 225lbs/inch 5.5" OD *Image example is a 700lbs/inchSwift conventional springs are mainly utilized in motorsports ranging anywhere from dirt to pavement where we've engineered for corner specific with our HS5. TW proprietary material, providing the optimal spring design to maximize your vehicle potential amplifying every advantage. The Progressive Springs were developed to eliminate the need for spring rubbers to help keep consistency on the right rear of a Dirt Late Model. A true progressive rate!