The ornamental design for a controlknob for a shock absorber, as shown and described.
FIG. 1 is a front, right side, bottom perspective view of a control knob for a shock absorber showing my new design;
FIG. 2 is a rear, left side, bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof, a right side view being symmetrical; and,
FIG. 6 is a top plan view thereof, a bottom plan view being symmetrical.
The broken lines in the Figures show portions of the control knob that form no part of the claimed design.
The control knob can be for a shock absorber for a motorcycle. The control knob can be for adjusting a buffering property, a vibration suppression characteristic, and a function of a motorcycle body posture control for a motorcycle.