Thin little inside wheel bearings on these cars hey arrma! Buying hot racing hubs so I can get a larger inside bearing that well last longer. (ARRMA COME ON! How can they expect these little bearings to hold up under 6s power. Come on RPM ! Rpm makes over sizr hub with over size bearing,best upgrade you can get for it. Probably be your best interest to increase wheel bearings,most RC vehicles are missing the bus when it comes to wheel bearings. Don't just blast,bash your bearings should be your modo.. Arrma should design a roller chassis that well stand up to 6s an leave under size components on 4s line,be great.