12x21x5 Ceramic Metal

The 12x21 Ceramic Metal Series bearings are a low friction bearing with several options to help satisfy anyone's desire.

12x18x4 Halo bearing by Avid Racing Concepts is the standard outdrive bearing for nitro touring cars and 8th scale onroad cars such as the Kyosho RRR, Mugen MRX4, and Serpent 710. They are also used in the Revo, so check your manual for the correct size for you vehicle if you are not certain. Instead of the steel balls they use silicone nitride ceramic balls (Si3N4).

• METRIC: 12mm (Inner) x 21mm (Outer) x 5mm (Width)
• STANDARD: 0.47244" (Inner) x 0.82677" (Outer) x 0.19685" (Width)