How to Use a FOX Shock Pump for Suspension Setup

By FOX Canada | Published: 2026-10-26

Category: How-to Guides

Learn how to set your mountain bike suspension pressure with a FOX Shock Pump. Step-by-step instructions, common mistakes, and pro tips for sag and rebound.

Quick Answer

Use a FOX Shock Pump to set your suspension pressure to the recommended PSI for your weight and riding style, then fine-tune with sag and rebound adjustments for a balanced ride.

Why Use a Shock Pump Instead of a Regular Pump?

Shock pumps are designed to move small volumes of air at high pressure, unlike floor pumps which move large volumes at low pressure. Using a regular pump risks over-pressurizing your shock or fork and can damage seals.

The FOX Shock Pump features a micro-adjust air-bleeder that allows fine 2-3 PSI adjustments, so you can dial in pressure precisely without overshooting.

Setting Sag: The Foundation of Suspension Setup

Sag is the amount your suspension compresses under your body weight. It's the starting point for all other adjustments. Too little sag makes the ride harsh; too much sag causes bottom-outs and poor pedaling efficiency.

Always set sag with your full riding gear on, including a hydration pack if you ride with one. This ensures the pressure supports your actual riding weight.

Step-by-Step Shock Pump Setup

Check Recommended Pressure: Look up the recommended PSI for your fork and shock. This is usually printed on the air can or found in the owner's manual. Start with the middle of the range for your weight. Write down the recommended pressure and your starting PSI before you begin.
Screw the Pump Securely: Remove the valve cap and screw the FOX Shock Pump head onto the valve until it's hand-tight. The swivel head allows you to align the pump for easy reading and access. If you hear air hissing, the pump isn't sealed; retighten gently.
Inflate to Target Pressure: Pump in short strokes until the gauge reads your target PSI. The micro-adjust air-bleeder lets you release tiny amounts of air to fine-tune without overshooting. Always check the pressure after disconnecting and reconnecting the pump, as air loss can occur.
Set Sag: With the pump removed, sit on the bike in your riding position. Use the O-ring or a zip tie to measure sag. Aim for 15-20% sag for the fork and 25-30% for the rear shock (adjust per manufacturer). If sag is too much, add 5 PSI; if too little, release 5 PSI. Repeat until sag is in range.
Dial in Rebound and Compression: Use the rebound dial to control how fast the suspension extends after compression. Start with the recommended setting and adjust based on feel: faster for rough trails, slower for smooth climbs. Make one adjustment at a time and test ride to feel the difference.

Product Spotlight

FOX Shock Pump: The FOX Shock Pump has a durable stainless swivel pump head (UP-SA) and a foldable hose for easy access to shocks in tight spaces. This design lets you reach awkward shock valve positions without removing linkages, saving time during setup.
FOX Shock Pump
FOX Shock Pump: It features a micro-adjust 2-3 PSI air-bleeder and a max pressure of 350 PSI. You can fine-tune pressure in small increments and the pump covers all shock types, from trail to downhill.