Thank you for purchasing your new OB4 Systems releasable binding system. Before you begin skiing there are a few things you should know to make your skiing experience both enjoyable and safe.

Both boots will release from the double boot system. It is simple physics, the releases are set to the same release pressure which is below the threshold for injury to the skier based on skier weight and ability. Therefore if the pressure is not sufficient to release the system it is also not sufficient to injure the skier.

From the factory, the bindings are set at a lighter release setting. Increasing the tension on the spring will increase the amount of retention the system has. This is done by turning the adjustment screw in a clockwise rotation. The more tension the spring has on it, the less likely you will be released from your ski in the event of a fall. The degree of retention you will require will depend on your height, weight, and skiing ability. Adjustments should be made one quarter of a rotation at a time. Understand, that over tightening the spring could result in the binding not releasing in the event of a fall, leading to injury. You can use the sight window on the side of the spring housing to visually identify and verify the release settings
Video: (OB4System settings)

If you are new to hard-shell boots, you will experience increased lateral control that will take some time to get used to. You should not expect to go out and ski exactly as you have before. To get used to skiing with hard-shell boots, it is best to ski narrow on the boat and make slow smooth turns to avoid overturning the ski. Take it slow, think “easy”, and soon you will have more control over your ski than ever before.

The OB4 Systems release system has been installed on an aluminum plate which mounts directly to your ski's binding inserts.  The new OB4 System mounting plate will fit all major ski manufacturers patterns. Most likely you will need additional inserts for the mounting slots adjacent to the front binding's spring housing. These inserts should be installed by a professional at a pro ski shop or by the ski manufacturer. For temporary installation without screws, the spring housing area may be attached with a hook and loop material or 3M Auto trim tape adhesive material. This is primarily for trial purposes, but may be used for extended time with careful monitoring by the user.

Before removing your existing bindings, mark the placement of your front boot by measuring from the tail of the ski to the back of the front heel. Place your OB4 Systems mounting plate on the ski with boot in place and measure from the tail to the back of the front heel. We recommend that you start with your boot one quarter to one half of an inch back from your previous settings. As you become more accustomed to the increased lateral control and leverage, you can then move your boot forward as needed.

It is imperative that whatever boot you use it must remain on your foot during a fall. Failure to do so will affect the operation of the release. Also, if the boot releases and comes off your foot, it will sink.

If you are using a single boot system, you should not use any type of high wrap boot or binding in the rear, as your rear foot must release at the same time in any fall. The preferred method is to use a rear toe plate/strap.

FYI, some things to note... As with other hard shell systems, the boots do not float, so taking them off in the water is not advised. The releases and mounting plates do not float. Therefore leaving the boots on the ski without your feet in them could cause some skis to sink (some modern skis do not have much floatation built in). Always take the boot off the ski, and then take your feet out of the boot once out of the water. That is what the release lever is for. The system is designed for the boots to be put on first then snapped into the release. That saves balancing on the ski while putting on the boots. Also the liners last longer if you put them into the boots first, then slide your foot in. Be sure the boot is opened wide enough to get your foot in without excessive tugging.

If you have any questions about mounting your OB4 Systems product on your ski, please call us for assistance at 816-586-2158, or email us at Keep in mind that the use of this product will not totally eliminate the risk of serious bodily injury, and you use it at your own risk.

OB4 System Adjustment Chart

NOTE: the release is preset to ±50 ft/lbs (white cross aligns with red dot). Adjust screw ½ turn at a time clock wise to increase or counter clock wise to decrease 6-7 ft/lbs.
NOTE: skier should visually identify and note the setting mark in the site window for reference before making any adjustments to the tension adjustment screw.
NOTE: Please contact OB4Systems, Inc. for release settings on Jump skis.

Step 1.  Determine the type of skier from one of the following groups:
·       Type A. Cautious skiing at lighter release setting, narrower margin of retention in order to gain a wider margin of release.
·       Type B. Average to moderate skiing at average release/retention setting, balanced release and retention setting.
·       Type C. Aggressive, high speed or short line skiing at higher release/retention settings, a narrower margin of release in    
         order to gain a wider margin of retention.

Step 2.  Find the release code (letter H thru O), which corresponds to the skier’s weight, as well as the release code, which corresponds with the skier’s height.  If they are not the same, choose the one closer to the top of the chart.
EXAMPLE: if the skier’s weight is 170 lbs. (code K), and the height is 6’1” (code L), choose code K as the correct line of the chart to read.

Step 3.   Make an adjustment for the skier’s type and age. The selection from step 2 is for a Type A skier. If the skier type is Type B move down the chart one code. If the skier type is Type C move down the chart two codes. If the skier is age 50 or over, move up one code.

Step 4.  The spring tension has been preset to the ‘K’ setting (±50ft/lbs.). Adjust to the desired release tension reference setting by rotating the adjustment screw clockwise to increase by 6-7ft/lbs. per half turn or counterclockwise to reduce by 6-7ft/lbs.  You can test the release pressure as shown in the ‘setting the release tension’ video by using a torque wrench.

WARNING: OB4Systems, Inc. releases are designed for use by advanced skiers! Setting and maintaining the correct release tension is the skier’s responsibility!



The most important piece of advice we at OB4 Systems can give you is to keep all sand and dirt out of all binding parts.

Before each time you ski you should check tightness of all screws, the boot plate socket and wedge, and the wedge block for excessive wear. Make sure the spring lever on the bindings snap back immediately when you lift the lever and let it go. If not, do not use the system!

While walking in the boots is comfortable and easy it is not recommended. Walking in the boots may cause excessive wear of the boot plate wedge and socket, as well as the rubber sole. If the boot plate wedge and socket show pitting or excessive wear, do not use! The wedge and socket must be replaced periodically. Video: (Care of your OB4System Boot)

The plunger and cam cavity will need to be lubricated with white lithium aerosol grease periodically. Lubricate every 10 skiing sets or as needed. If the binding lever no longer snaps back immediately when you lift it and let go, you need lubrication. If you ski in salt or silty water, the bindings will require lubrication and maintenance more often. Video: (Care of your OB4System)

During the off-season, you should remove the adjuster screw and retention spring. Spray the inside of the spring housing with white aerosol lithium grease, so the handle and plunger move freely. If the plunger or cam has any signs of pitting or corrosion or excessive wear, do not use the system! Contact OB4 Systems for repairs or replacement! Video: (Storing your OB4System)

Please remember, water and sand do not mix well with any mechanical system, and regular inspection and maintenance is required to keep your bindings in top working condition.

For questions about service and maintenance of your binding system contact OB4 Systems at 816-586-2158.