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Installing Your Fork | Before You Ride | Setting Sag | Adjusting Rebound | Locking Out the Fork | Adjusting Lockout Force | Adjusting Low-Speed Compression | About Terralogic® Brassmass™ | Adjusting Terralogic® Threshold | Service Intervals | Important Safety Information

Installing Your Fork

Be sure your fork is properly installed before proceeding. If your fork came pre-installed on your bicycle, continue to the next section.

Before You Ride

1. Check that quick-release levers are properly adjusted and tightened.
2. Clean the outside of your fork with mild soapy water, and wipe dry with a soft, dry rag.

   NOTE:  Do not use any solvents or de-greasers, as these products can cause serious damage to paint and anodized parts (upper tubes, knobs, steerers).

   Do not spray water directly on the seal/upper tube junction. Do not use a high pressure washer on your fork.

3. Inspect the entire exterior of your fork. The fork should not be used if any of the exterior parts appear to be damaged. Contact your local dealer or FOX Racing Shox for further inspection and repair.
4. Check your headset adjustment. If loose, adjust it accordingly to your bicycle manufacturer's recommendations.
5. Check that all brake cables or hoses are properly fastened.
6. Test the proper operation of your front and rear brakes on level ground.

Setting Sag

You can also view a Flash video on Setting Sag.

To get the best performance from your fork, it is necessary to set and adjust sag. Generally, sag should be set to 15 – 25% of total fork travel.

1. Unscrew the blue aircap on top of the left fork leg to expose the Schrader valve.
   
2. Attach a FOX Racing Shox High Pressure Pump to the Schrader valve.
3. Pump your fork to the appropriate setting from the Suggested Air Spring Pressure Settings table below, then remove the pump.

   TIP: Use your air spring PSI value in "Suggested Air Spring Pressure Settings" only as a starting point. Discovering your own best sag value is a dynamic process that takes some time to fully discover, given your riding style, bike geometry, total weight, and suspension feel preferences.

4. Unless your fork already has a sag setting o-ring on an upper tube, install a zip tie to an upper tube. Slide the o-ring or the zip tie down against the scraper lip of the fork dust seal.
5. Make sure you turn off your fork lockout.
6. Dressed to ride (meaning a filled hydration bag, if you use one), position your bike next to a wall or table to support yourself. Without bouncing, mount your bicycle. Assume a normal riding position for at least 30 seconds, allowing the suspension to fully settle. Distribute your weight evenly between the saddle, handlebars and pedals, as you would naturally position yourself when riding.
7. Dismount your bike without bouncing downward, to avoid further moving the o-ring or zip tie. Measure the distance between the seal and the zip tie. This measurement is your sag value.
8. Compare your actual sag value to your target sag value in the Sag Setup table below.
   
   
   • If your sag measurement value is less than the Sag Setup table value, screw on the pump fitting, note the current air pressure setting and depress the black bleed-valve to reduce the gauge pressure by 5 psi. Measure sag again and repeat this adjustment, if necessary.
   • If your sag measurement value is greater than the Sag Setup table value, screw on the pump fitting, note the current air pressure setting and pump to increase the gauge pressure by 5 psi. Measure sag again and repeat this adjustment if necessary.
   
   
9. Screw the blue aircap back on, and go ride.
   
   

   Rider Weight lbs.	Suggested Air Spring Pressure Settings PSI
   	80 mm	100 mm	120 mm	140 mm	150 mm
   ≤125	60	55	50	45	40
   125 - 135	60	55	50	50	45
   135 - 145	65	60	55	55	50
   145 - 155	75	70	65	65	60
   155 - 170	85	80	75	70	65
   170 - 185	90	85	80	75	70
   185 - 200	95	90	85	80	80
   200 - 215	100	95	95	90	90
   215 - 230	110	100	100	100	100
   230 - ≥250	120	110	110	110	110

   
   

   Sag Setup
   Travel	XC/Race FIRM	All-Mountain PLUSH
   80 mm (3.50")	12 mm (0.50")	20 mm (0.75")
   100 mm (3.90")	15 mm (0.62")	25 mm (0.98")
   120 mm (4.70")	18 mm (0.69")	30 mm (1.19")
   140 mm (5.50")	21 mm (0.81")	35 mm (1.38")
   150 mm (5.90")	23 mm (0.91")	38 mm (1.50")

   
   

   Sag Troubleshooting
   Symptom	Remedy
   Too much sag	(+) air pressure in 5 psi increments
   Too little sag	(-) air pressure in 5 psi increments
   Excessive bottoming	(+) air pressure in 5 psi increments
   Harsh ride; full travel not utilized	(-) air pressure in 5 psi increments

Adjusting Rebound

The rebound adjuster knob is located at the bottom of the right fork leg. This knob has 18 clicks of adjustment range.

Rebound controls the rate of speed at which the fork extends after compressing. Turning the knob clockwise slows down rebound; turning the knob counter-clockwise speeds up rebound. As a starting point, turn the rebound adjuster knob all the way clockwise (full in) until it stops, then turn counter-clockwise (out) 12 clicks.

Locking Out the Fork

The blue compression lockout lever, located just below the black lockout force adjuster knob, allows you to close the compression damping circuit in the fork. This keeps the fork at the top of its travel, making it harder to compress.

NOTE:  When you adjust the compression lockout lever, the black lockout force adjuster knob will also move. This is normal; the lockout force adjustment setting will not be affected.

Rotate the lever fully clockwise to lockout the fork. This position is useful in climbing and sprinting situations, but will sag with the rider’s weight. The fork will "blowoff" in the event that a big hit is encountered with the fork locked out.

To unlock the fork, simply rotate the lever fully counter-clockwise.

NOTE:  The fork may cycle a couple of times after enabling lockout. Once complete lockout is achieved, the fork may continue to move 3 - 5 mm. This is normal and does not affect performance.

Adjusting Lockout Force

Even when your fork is fully locked out, there are instances when you still want your fork suspension to be active. To protect your fork's internal parts, your FOX fork will "blowoff" when it encounters an intense hit. You can adjust when the fork blows off—lockout force—by adjusting the black knob on the right-side top cap.

A convenient tuning feature of the lockout force knob is that it allows you to leave your fork in the locked out position—no more fiddling with fork controls when the trail requires your undivided attention. Although you might need to adjust the knob a few times to find the sweet spot, once it is found you can simply leave your fork locked out. Your fork will then respond to hits in the trail for example, but will be locked out when you are out of your saddle on a climb.

Turn the knob clockwise to increase lockout force and counter-clockwise to decrease lockout force.

NOTE:  When you adjust the black lockout force adjuster knob, hold the blue compression lockout lever in place.

There are 10 clicks of adjustment. As a starting point, turn the knob all the way clockwise until it stops, then back off one click counter-clockwise.

Adjusting Low-Speed Compression

Low-speed compression damping is adjusted with the blue bezel ring that is positioned just below the blue lockout lever. This ring has 8 clicks of adjustment range. Compression damping controls the fork compression speed. Adjust the low-speed compression with lockout off (the lockout lever turned fully counter-clockwise). The factory setting is 8 clicks out counter-clockwise, from fully in clockwise.

Terralogic® Brassmass™

The Terralogic® damper contains a weighted brass inertia valve called Brassmass™, which freely slides on a shaft to open and close compression flow ports in the damper.

The Brassmass™ assembly automatically responds to the impact of bumps or potholes in the trail, opening the compression flow ports and allowing the flow of damping oil. The Brassmass™ assembly does not respond to rider input (pedaling, sprinting, G-outs), keeping the compression flow ports closed and maintaining the pedaling platform or the feeling of fork lockout. With the patented timer circuit constantly in control as you ride, the transition between maximum pedaling efficiency and low speed damping control is nearly instantaneous.

The 15-position blue Terralogic® threshold adjust knob located on the bottom of the right fork leg allows you to fine-tune your pedaling platform balance anywhere between lockout-firm to fully open plush damping (or zero pedaling platform).

Adjusting Terralogic® Threshold

Terralogic® threshold is an adjustable compression blow-off valve that bypasses the Brassmass™ assembly, adjusted with the blue knob located on the bottom of the right fork leg. This knob enables you to regulate compression platform when the Brassmass™ assembly is closed.

NOTE:  If you have just set your rebound, return the blue Terralogic® threshold adjust knob to fully clockwise in, before making your Terralogic® threshold adjustment.

To make pushing through the fork travel harder and increase the pedaling platform, turn the threshold adjust knob clockwise. Turning the adjust knob completely clockwise makes the fork feel locked out—until the Brassmass™ activates from the force of impacting a bump in the trail terrain.

To make pushing through the fork travel easier and decrease the pedaling platform, turn the threshold adjust knob counter-clockwise. Turning the knob fully counter-clockwise bypasses the effect of the Brassmass™ assembly entirely. The threshold adjust knob has fifteen (15) clicks of adjustment.

In the table below, FOX offers a suggested range of Terralogic® threshold adjustment settings per fork travel, as a starting point for your experimentation. As no two riders are the same (weight, strength, riding style, terrain choices, or simply that personal preference with riding "feel"), FOX encourages you to spend some time exploring the possibilities with Terralogic® threshold adjustment, to discover that "sweet spot" when it just feels right to you.

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FOX Factory Inc.