What are win tube or hydro shocks?
The twin-tube design is the most common and often times the least expensive. These are the ordinary shock absorbers that typical passenger cars and trucks use, and they are widely available at car dealerships, auto parts stores and repair facilities. As the name implies, in a twin-tube shock, there are two actual tubes one the outer shock body and the other a cylinder inside in which the piston moves. Tiny holes or orifices in the piston as well as special valves between the inner and outer tubes restrict the flow of oil to control wheel motion. The limitations of twin-tube shocks become apparent when they are used over very bumpy roads. In this case, the rapid motion of the piston can cause the oil to overheat and to foam, reducing the shock absorber’s ability to control wheel motion. The result is a ride that becomes increasingly sloppy, especially when traveling over a washboard surface. Heavy-duty twin-tube shock absorbers are usually stronger, with more robust piston shafts and mo
