PMI SC50-BK 50mm Sprocket Hub - Black Anodized Aluminum with 8mm Keyway - European Metric Chassis

Maximizing power transfer on your racing go kart requires eliminating every ounce of drive-line slop and unnecessary rotating mass. The PMI SC50-BK 50mm Sprocket Hub is engineered for drivers who demand zero slip from their engine to the rear axle. Whether you are running a high-revving two-stroke or trying to maximize your briggs and stratton lo206 horsepower, this black anodized billet aluminum hub delivers the rigid, perfectly concentric foundation your chassis needs to dominate the podium.

Cross-Referencing Your Parts Number for Exact Fitment

Stop guessing with generic hubs. When you verify your parts number against the SC50-BK, you are guaranteeing a flawless fit for any European standard 50mm metric axle. The precision-machined 8mm keyway locks the hub dead-center, eliminating the micro-vibrations that can rob you of top-end speed. A secure sprocket means your chain alignment stays true, reducing friction and preventing catastrophic chain throws during aggressive out-of-corner acceleration.

From Mini Parts to Senior Classes: Universal Metric Compatibility

Whether you are upgrading mini parts for a cadet chassis or outfitting a full-size senior kart, this 50mm hub scales to your competitive needs. The generous 6mm (.250") through-holes make rapid gear changes in the hot pits a breeze. You won't be fighting stripped bolts or misaligned pitch circles when the track conditions change and you need to drop two teeth before the final.

Clearing Chassis Components and Managing Heat

Clearance is always a battle on a tightly packed kart. The compact, lightweight profile of the PMI SC50-BK ensures you have ample room around your bearing cassettes and water pump pulleys. Furthermore, as high-performance engine parts exhaust hot gases and radiate heat, the premium black anodized finish of this hub resists thermal degradation and corrosion from harsh track chemicals, chain lube, and debris.

• High-Grade Billet Aluminum: CNC-machined for absolute concentricity, reducing rotational runout and chain wear.
• European 50mm Standard: Perfectly matches metric axles used by top-tier international and domestic chassis brands.
• Precision 8mm Keyway: Locks firmly onto the axle to transmit torque instantly without keyway slop.
• 6mm / .250" Mounting Holes: Standardized through-holes for quick, hassle-free sprocket swaps in the hot pits.
• Black Anodized Finish: Defends against oxidation, chain lube degradation, and track debris while maintaining a pro look.
• Lightweight Profile: Shaves critical rotating mass to improve acceleration and braking response.
• Versatile Application: Ideal for everything from low-horsepower four-strokes to high-output shifter karts.

Frequently Asked Questions

Q: Is this hub compatible with all kart axles?

A: The PMI SC50-BK is specifically engineered for European standard 50mm metric axles. Please verify your axle diameter before purchase to ensure a proper fit.

Q: Does this hub include the key for installation?

A: This hub features a precision-machined 8mm keyway designed to lock onto your axle. Please ensure you have the appropriate 8mm key stock for your specific axle setup.

Q: How does the black anodized finish benefit my kart?

A: Beyond providing a professional aesthetic, the black anodized coating acts as a protective barrier against oxidation, harsh track chemicals, and degradation from chain lubricants, ensuring a longer service life.

Q: Can I use this hub for both sprint and oval racing?

A: Yes, the rigid, lightweight billet aluminum construction is designed to handle the torque requirements of various classes, from high-revving two-strokes to four-stroke engines like the Briggs & Stratton LO206.

Q: What is the benefit of the 6mm through-holes?

A: The standardized 6mm (.250") holes are designed for rapid sprocket changes in the hot pits, allowing you to adjust your gear ratio quickly without dealing with stripped hardware or alignment issues.

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