Product Overview 15x21x4 rubber bearing by Avid Racing Concepts is the standard outdrive bearing for Team Associated RC8B, RC8T, RC8BE, Mugen MBX6, MBX6T, MBX6-ECO, and Losi LST2. Check your manual for the correct size for you vehicle if you are not certain. Check your manual for the correct size for you vehicle. Below are the other bearings that are used in the Losi LST2. Bearing Dimensions METRIC: 15mm (Inner) x 21mm (Outer) x 4mm (Width) STANDARD: 0.59055" (Inner) x 0.82677" (Outer) x 0.15748" (Width)