5x14x5mm Metal Shielded Avid RC Ball Bearing is a popular bearing for Tekin Pro4, Novak, and Neu-Castle motors. Check your manual for the correct size for your vehicle if you are not certain.
Bearing Dimensions
METRIC: 5mm (Inner) x 14mm (Outer) x 5mm (Width)
STANDARD: 0.19685" (Inner) x 0.55118" (Outer) x 0.19685" (Width)