Abstract: A device for modifying a shock absorber so that the preload of the shock absorber spring may be adjusted. The device has a chamber member having a cylindrical inner member with an inside diameter slightly larger than the outside diameter of the shock absorber body. The chamber also has a cylindrical outer member sealingly attached at the upper end to the inner member. A piston is slidingly positioned in the chamber between the outer and inner cylinders and the piston forms a seat for the shock absorber spring. Hydraulic fluid is pumped into the chamber and by the addition of hydraulic fluid the spring of the shock absorber is compressed and the amount of preload between the shock absorber's relatively moveable parts is thereby increased.

Abstract: A device for extending the travel of motorcycle shock absorbers without the necessity of replacing the damper rod within the shock absorber. The device is a member having a cylindrical body portion with a frustro-conical portion which terminates in a threaded extension member extending outwardly axially with respect to the body. An axially aligned threaded opening is positioned in the base of the member and has the same thread size as the threaded extension of the member. Alternatively, the device can consist of a two part member having a central threaded bolt surrounded by a cylindrical length having a frustro-conical terminus. An oil flow stop member may be included for insertion into the central passageway of the damper rod of the shock absorber for use with certain shock absorbers where necessary to maintain an appropriate metering ratio when the original cone is replaced with the device of the present invention.