ProTek RC 15x21x4mm Ceramic Dual Sealed "Speed" Bearing (2)

The ProTek RC 15x21x4mm Ceramic Dual Sealed “Speed” Bearing is a pack of two hybrid ceramic ball bearings designed for the R/C racing enthusiast. Each bearing uses Chrome Steel inner and outer races with Si3N4 silicone nitride ceramic balls.

Features

• 15x21x4mm bearing size
• Dual sealed design
• Hybrid ceramic construction
• Ceramic balls provide reduced friction and vibration compared with standard steel bearings
• Designed for high RPM capabilities, corrosion resistance and wear resistance

Care Notes

• Ensure the bearings are properly shimmed; do not shim them too tight.
• Keep the bearings lubricated to help ensure long life.
• Tri-Flow Teflon based bicycle lubricant is recommended for ceramic bearings.