General Maintenance | Before You Ride | Setting IV Sag | Adjusting Rebound | Adjusting Brain Fade™ | Important Safety Information
Figure 1: Stumpjumper™ IV Shock, 26" & 29" Wheel: Figure 2: Micro IV Shocks: Epic™ M-XL, Epic™ Small, Epic™ 29, ERA™ |
features |
standard air sleeve, inertia valve damping, lightweight chassis, Brain Fade™ adjust, air spring pressure, rebound adjust |
spring |
air |
|
intended use |
all-mountain, cross-country |
The IV rear shock family is supplied as original equipment (OE) with the following Specialized® bicycle models:
Bicycle Model | Eye to Eye | |||
Shock Travel | SAG Measurement, % of shock travel | |||
25% inches (mm) | 30% inches (mm) | |||
Stumpjumper™ 26‡ | 7.75 (196.85) | 1.93 (49.00) | 0.48 (12.25) | 0.58 (14.70) |
Stumpjumper™ 29‡ | 7.75 (196.85) | 1.75 (44.45) | 0.44 (11.10) | 0.53 (13.33) |
Epic™ M-XL | 7.36 (187.00) | 1.85 (47.00) | 0.46 (11.75) | 0.56 (14.10) |
Epic™ Small, Epic™ 29, ERA™ | 7.28 (185.00) | 1.69 (43.00) | 0.42 (10.75) | 0.51 (12.90) |
‡ With the Stumpjumper™ shocks, the eye to eye measurement extends from the center of the shaft eyelet to the flat on the body end.
Rebound controls the rate at which your shock returns after it has been compressed. The proper rebound setting is a personal preference, and changes with rider weight, riding style, and terrain. A basic rule of thumb is that rebound should be as quick as possible without kicking back hard, bucking you off the saddle.
The rebound knob has 8-10 clicks of adjustment.
For slower rebound, turn the red adjuster knob clockwise.
For faster rebound, turn the red adjuster knob counterclockwise.
All IV rear shocks are equipped with Brain Fade™ technology, which gives you the ability to adjust your shock from firm to plush to match your riding terrain. The inertia valve automatically switches from your pre-adjusted Brain Fade™ setting to a fully plush feel when the rear wheel hits a bump.
For a firmer ride setting, turn the Brain Fade™ adjustment knob clockwise.
For a softer ride setting, turn the Brain Fade™ adjustment knob counterclockwise.
Note: IV rear shocks are not 100% user serviceable, meaning that if seals or rings are found to be in need of replacement, this level of service must be done by FOX Racing Shox service, or by an Authorized Service Center.
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