RBI Bearing UC207-20K 1 1/4" Large OD Axle Bearing - 2.835" OD - All Classes

Minimizing rear chassis flex and maximizing power transfer is critical for high-stakes circuit racing. Sourced directly from our professional karting store inventory, the RBI 1 1/4" Large OD Axle Bearing (2.835")—widely known in the paddock as the "BIG" bearing—provides unmatched driveline support. By distributing stress evenly across the axle housing, this heavy-duty UC207-20K bearing eliminates misalignment during aggressive cornering and straight-line sprints. When you are pushing the limits of mechanical grip, the last thing you want is a bound-up rear axle robbing your momentum.

Driveline Reliability That Matches Your Powerplant

It’s easy to get distracted by a high-horsepower motor engine for sale, but putting that power to the pavement requires a bulletproof rear end. With its expansive 2.835-inch outer diameter, this bearing increases the contact area within the cassette, drastically reducing rotational resistance. The result? Smoother spins, lower lap times, and a setup that stays composed under immense pressure. The larger outer race absorbs the harmonic vibrations generated by high-RPM engines, ensuring your chassis remains settled through high-speed sweepers and tight hairpins alike.

Precision Maintenance for Peak Performance

Just as you rely on precision tire tools to manage your pressures and premium tire cleaner to prep your rubber for maximum grip, your bearings demand the same level of meticulous attention. This free-spinning bearing features a removable oil hole plug, allowing for critical lubrication that safeguards against overheating during prolonged endurance sessions. Proper maintenance of this bearing ensures that your axle spins freely race after race, eliminating the parasitic drag that plagues neglected drivelines.

• Expansive 2.835" Outer Diameter: Distributes lateral loads evenly across the cassette to prevent axle flex and binding under heavy cornering forces.
• Precision 1 1/4" Inner Bore: Provides a flawless, tight tolerance fit for standard 1.25-inch racing axles, eliminating unwanted play.
• Free-Spinning Design: Significantly reduces rotational mass and parasitic drag to help you shave crucial tenths off your lap times.
• Accessible Lubrication Port: Easily remove the oil plug for quick, trackside maintenance, ensuring optimal heat reduction and longevity.
• Heavy-Duty UC207-20K Spec: Engineered specifically to withstand the extreme vibrations and lateral G-forces of competitive kart racing.
• Universal Chassis Compatibility: The ideal driveline upgrade for teams reinforcing their current setup before hunting for a new go kart frame for sale.