Outfit your semi truck to be Ready for the Road Ahead™ with enhanced flexibility and support, with the OTR 5/8"-18 x 4-1/2" Leaf Spring Roller Assembly. To reduce the amount of friction between the leaf spring and other components, this replacement assembly features a rolling design that improves overall ride quality. Constructed with high-quality, durable materials to provide long-term suspension support. FleetPride is your First Click in Heavy Duty®.