OTT 50x80mm C4 Axle Bearing – Racing Kart Rear Axle Bearing
Built for serious racers who demand precision and durability, the OTT 50x80mm C4 axle bearing is manufactured to German DIN standards for smooth rotation, reduced drag, and maximum reliability under the extreme loads of kart racing.
The C4 internal clearance is optimized for heat expansion and high-speed operation, allowing freer spin and lower rolling resistance compared to standard clearance bearings — ideal for sprint, shifter, and endurance racing.
Each bearing features a no-drag, shieldless design and is pre-lubricated with lightweight racing grease to promote quicker acceleration and consistent on-track performance. Three integrated set screws provide a secure, slip-free grip on the axle under heavy braking and cornering loads.
This bearing fits any kart chassis using standard 50mm axle / 80mm outer diameter bearings, making it compatible with a wide range of sprint and shifter kart brands. The 50x80 size is also used as the OEM rear axle bearing across the OTK chassis family, including Tony Kart, Kosmic, Exprit, EOS, Redspeed, and Gillard.
Precision-machined for exact tolerances, these bearings deliver smoother rotation, longer service life, and dependable performance race after race.
Features
• 50mm ID × 80mm OD axle bearing
• C4 high-speed internal clearance (race optimized)
• Manufactured to German DIN precision standards
• Shieldless design for minimal drag and freer spin
• Lightweight racing grease pre-lubricated
• 3 integrated set screws for secure axle retention
• Fits most kart chassis using 50x80 rear axle bearings
• OEM bearing size used on OTK chassis (Tony Kart, Kosmic, Exprit, EOS, Redspeed, Gillard)
