Gripsters Freeline BirelArt Kit - Tire Safety Screws

Secure your tires and prevent them from rotating on the rim, even in the most extreme grip conditions, with this original BirelArt gripster kit (safety screws).

Made by Freeline, birelArt Group’s official accessories and components brand, this kit is the benchmark for equipping your wheels and ensuring that the tire and wheel act as one unit during hard acceleration and braking.

ℹ️ Important note: This complete kit is specifically designed for BirelArt / Freeline rims prepared to accommodate beadlock inserts. Assembly is required for the vast majority of karting competition categories.

Kit Description and Contents

The kit is delivered complete to equip a set of wheels (2 front rims and 2 rear rims, or 4 rims depending on the type of fitment.) It includes:

• Number of screws: 12 gripster screws (Quantity generally suitable for equipping 3 screws per rim, standard Birel/Freeline.)

• Screw type: Knurled-head screw with threaded section, designed to bite into the tire bead.

• Sealing gaskets: 24 o-rings (2 joints per screw, one on each side of the rim) to ensure perfect air-tightness in the tire.

• Clamping nuts: 12 cap nuts (or equivalent depending on the version) to securely lock the screws onto the rim.

• Assembly tool (depending on model:) A specific Freeline assembly key (t-handle with tip) is included for easy installation and removal of gripsters without damaging them.

Technical Specifications

• Document type: Gripsters / Tire safety screws.

• Source: Original manufacturer part (BirelArt / Freeline.)

• Material: High-strength galvanized steel for screws and nuts. Nitrile rubber for seals.

• Compatibility: Designed for BirelArt / Freeline wheels with the appropriate mounting holes.

• Usage: Prevents the tire from slipping off the rim (bead unseating.)

• Packaging: Sold as a complete kit for 4 rims.

? The Little Story: Why Use Gripsters ?

In karting, the lateral and longitudinal forces are enormous. During strong acceleration when exiting a corner, the tire, that adheres to the track, tends to want to remain in place while the rim, powered by the engine, it spins. This phenomenon creates significant shear force at the tire bead.

Without Gripster, the tire can “spin” on the rim. Not only does this cause a loss of acceleration, but above all, this can lead to a sudden loss of pressure, the tire could detach from the rim bead.

Freeline, in collaboration with the BirelArt racing department, developed this simple but incredibly effective system. The rim lock screws pass through the rim, and their knurled heads embed themselves in the tire bead. The seals ensure that the rim remains airtight. It’s life insurance for your tires and a guarantee of consistent performance.

Follow the red. Drive BirelArt.

? Michel's Tip

“Michel, our equipment expert, recommends: When fitting new tires, make sure the rim lock screws are fully loosened (flush with the rim) before seating the tire bead. Once the tire is in place, hand-tighten the rim locks using the tool provided until the screw head is in contact with the tire bead, then give it one final quarter turn. Do not tighten them like a wheel nut—just enough to secure the tire. Remember to check the condition of the seals every time you change a tire; cracked seals will cause a loss of pressure.”

⚠️ Safety advice: Loose gripsters can damage the tire bead and cause a slow puncture. Excessive tightening could, in the long run, crack the rim around the hole. Follow your mechanic’s recommendations.

Order your Freeline BirelArt gripster kit now at Magickart.fr for uncompromising performance. Fast shipping.

? Product Information (GPSR) & Technical Summary