A team of ride control trained engineers use state-of-the-art computers, shock dynos and real world testing to create the ideal suspension platform for your bike. From there, Progressive's manufacturing facility assembles - and in many cases dyno tests - each unit before it leaves the factory. QC systems touch on each component from assembly to final stages of a part, and nothing gets in or out of the building without passing a rigorous inspection. Their product line up includes an in-depth line of shocks and fork springs for bikes dating back to the 50's right up through modern motorcycles.