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Adjustments to the HTS Miata shocks change both the rebound and compression damping simultaneously, with an infinite adjustment range between the soft and hard settings. Each HTC Miata shock is adjustable by simply rotating the tuning sprocket on the top of the shock rod. Note it is tough to reach the rears for adjusting which is why Tokico makes optional adjustment cables for the rear (see our part 60-1144NC).
BRIAN'S APPLICATION NOTES: The top adjustment knob is coming through a hollow tube that can be snapped off if install is not done properly. If you don't have a torque wrench and you don't know what you are doing....hire a Pro before you snap off the top! Once installed it is difficult to reach the top of the rear shocks for adjustment if you want to keep the factory plastic trunk liner installed. Tokico's answer to this issue is an optional set of adjustment cables that we sell separately here. The cables pass through the plastic trunk liner to give you more easy access to adjust the rears.