Redcat Racing Ball Bearing, 3-Piece, 22 x 10 x 7" Ball Bearing (22*10*7) 2peices; Used with all: Rampage MT, Rampage TT and Rampage Rally models RC Car Parts : 50068 Genuine Redcat Racing Parts For troubleshooting and warranty information please contact a Redcat Racing Customer Service Specialist at 602-454-6445 or by emailing amazonsupport@redcatracing.com NOTE: Please read the User Manual before use.