Keeping you Ready for the Road Ahead , the HD Value Single Convoluted Air Spring 64636/1R13-140 176 offers a quiet, stable ride experience during changes in the vehicle’s weight, which are caused by load fluctuations. With heavy duty rubber bellow with more than 300 psi burst pressure, there is minimal wear and tear on your semi truck's suspension due to the vibrations of load fluctuations being isolated. With isolated vibrations, drivers’ comfort is enhanced by reducing fatigue and increasing attentiveness. FleetPride knows you need quality suspension and steering parts to reduce wear and tear and ultimately, downtime. Whether you need cab, truck or trailer air springs, we have the heavy duty air bag replacements that provides maximum safety, durability, and performance. FleetPride is your First Click in Heavy Duty .