Redcat Racing SH.28 & Sh.21 One Way Bearing SH.28 and SH.21 One Way Bearing Genuine Redcat Racing Spare Parts Redcat Racing Part Number h025 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.