Speed-Spec 40mm Precision Axle Bearing - 40mm ID x 80mm OD - Sprint & Road Course

Reducing driveline parasitic drag in high-performance go karts is just as critical as dialing in your fuel mixture. The Speed-Spec 40mm Precision Axle Bearing (SKU: SSB-40MM) is engineered specifically to minimize rolling resistance and maximize power transfer to the rear wheels. Built to exacting P5 precision tolerances with a C3 clearance specification, this 52100 chrome steel bearing outperforms standard commercial options. Its standout feature is the removable blue rubber seals, designed for racers who demand the ability to flush, clean, and re-lubricate their bearings between heats. This ensures your driveline remains buttery smooth, whether you're running a high-horsepower setup or a spec class where every fraction of a horsepower matters.

Integrating with Your Racing Go Kart Frame

A high-performance axle bearing is the vital link between your power plant and the track surface. When mounted to a modern racing go kart frame, the Speed-Spec 40mm bearing ensures that the torque generated by your engine for cycle or karting-specific motor is delivered without hesitation. Just as you would notice the immediate tactile feedback from a go kart steering wheel upgrade, upgrading to these low-friction bearings provides an instant improvement in chassis roll and corner-exit acceleration. It perfectly complements a finely tuned clutch assembly, ensuring that engagement translates directly into forward momentum rather than being lost to rotational friction.

Technical Specifications & Trackside Maintenance

Maintenance is the key to longevity in competitive karting. The removable blue seals allow mechanics to quickly pop the shields, purge contaminated grease, and repack with low-viscosity racing lube. This bearing is sold individually and includes a spare set of seals for unexpected trackside rebuilds, keeping your chassis rolling free all weekend long.

• Precision Engineering: Built to P5 precision tolerance with C3 internal clearance for ultra-low rolling resistance.
• Premium Materials: Constructed from hardened 52100 chrome steel for maximum durability under heavy side-loads.
• Removable Blue Seals: Easily pop out the rubber seals to clean, purge, and re-lubricate with lightweight racing oil.
• Exact Dimensions: Features a 40mm inner diameter and 80mm outer diameter, fitting standard 40mm metric axle cassettes.
• Secure Axle Lock: Equipped with dual set screws to prevent axle slippage and maintain precise track width.
• Bonus Hardware: Includes an extra set of replacement rubber seals to keep you prepared during grueling race weekends.
• Universal Compatibility: Ideal for sprint, road course, and oval chassis running a 40mm rear axle setup.

Frequently Asked Questions

Q: How do I know if this 40mm bearing fits my kart?

A: This bearing is designed for standard 40mm metric axle cassettes. Please measure your rear axle diameter with a digital caliper to ensure it is exactly 40mm before purchasing.

Q: Why are the blue rubber seals removable?

A: The removable seals allow you to flush out old, contaminated grease and re-lubricate the bearing with low-viscosity racing oil. This reduces internal friction and helps you maintain peak performance throughout the race season.

Q: How often should I clean and re-grease these bearings?

A: For competitive racing, we recommend inspecting and cleaning your bearings after every race weekend or whenever you notice increased drag. The included spare seals make this maintenance process easy to perform trackside.

Q: What is the benefit of P5 precision and C3 clearance?

A: P5 precision ensures the bearing runs true with minimal vibration, while C3 clearance provides the necessary internal space for the bearing to operate smoothly under the high thermal expansion and side-loads common in karting.

Q: Does this bearing come with set screws?

A: Yes, this bearing is equipped with dual set screws to ensure a secure lock on your axle, preventing slippage and maintaining your track width settings during high-G cornering.

Related Products From Vendor

• High-Performance 30mm Speed-Spec Axle Bearing with Blue Seals