According to the presence or absence of storage
Double tube - with storage tube
Single tube type - This type has no storage tube and uses a free piston at the bottom to separate air and oil between 25-30 Bar. Compared with the double tube type, the oil flow produces less noise and has excellent damping performance. Although it is light, a gas chamber is installed at the lower end of the shock absorber, so the basic length is longer, the friction force is greater, and it is weaker against external impacts.