Redcat Racing Motor Pinion Gear, 11T Motor Pinion Gear (11T); Fits 5mm motor shaft; Fits Rampage XBE and Chimera EP PRO RC Car Parts : 07403 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.