# Shock Adjustments

First of all, shocks should [always be kept at 300psi](/maintenance/maintenance-schedule/each-weekend/checking-shock-pressure.md). Check them before each track day and each race session.

When adjusting preload and ride height, [two APU13 wrenches](https://www.amazon.com/dp/B08H7TKKHK/ref=cm_sw_r_apa_i_F0DQKERTKJRBHZZDFWMZ_0?_encoding=UTF8\&th=1) are needed.

See the [Shock Diagram](/maintenance/shock-diagrams.md) for a full exploded diagram of the shock.

### Adjusting Compression and Rebound

Adjustment is best made using a small Allen key in the adjuster holes.

From closed, the compression adjuster (bottom, see picture) has 3.5 turns to fully open.

The rebound adjuster (top) has 4.5 from its fully closed position.

{% hint style="info" %}
To close, turn to the right. To open, turn to the left. Closed is up, open is down.
{% endhint %}

The thread pitches are different. If you start with both the compression and rebound closed and open them together by opening the compression adjuster (turn them left), both will be fully open at 3.5 turns of the compression adjuster.

When closing both to the fully closed position, it is best to start by closing both together until you feel a valve bottom out. **DO NOT force the adjusters** at this point as excessive force can dislodge the press-fit valve retainers. Once you feel one of the valves closing, open the rebound valve slightly and see if the compression valve can be further closed. Repeat until you are certain the compression valve has shouldered out and then close the rebound adjuster.

See below for a picture of the adjuster holes. The top is rebound, the bottom is compression. See the [Baseline Setup](/tunables/factory-baseline-setup-guide.md) for stock settings. In short, close both, turn the bottom (compression) adjuster 2 full turns to the left, then turn the top (rebound) left one more turn.

<figure><img src="/files/pbvkhTJyk8SDZZNK2vJg" alt=""><figcaption><p>An opened shock. The top adjuster is rebound, the bottom is compression. Turn right to close, left to open.</p></figcaption></figure>


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