This is a set of replacement Traxxas Engine Ball Bearings for the TRX 3.3, 2.5R, and 2.5 Engines. This includes one 7x17x5mm and one 12x21x5mm engine bearing. These engines have been used in many of the Traxxas nitro vehicles.
Front Bearing: 7mm x 17mm (5mm thick)
Rear Bearing: 12mm x 21mm (5mm thick)
Nitro Rustler 2.5
Revo 2.5 & 3.3
T-Maxx 2.5 & 3.3