Redcat Racing 21T/.6 Module Brass Pinion Gear Brass Pinion Gear (21T, .6 module) Genuine Redcat Racing Spare Parts Redcat Racing Part Number 11151 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.