TrailMaster Sport 550 21t Motor From Holmes HobbiesThe TrailMaster Sport is a budget motor built for messy, dirty, off road action. Whether on the rocks or in the dirt, the TrailMaster Sport is perfectly at home. Great choice for young drivers or running in the muck without ruining an expensive motor.Features:Zero timing, universal installation and rotation direction1/8th inch shaft diameterm3 mount holes, 25mm spacing, "540" standardball bearing on outputbronze bushing on end bellHigh strength Y45 Ferrite magnetsTech Notes:Every brushed motor carries a 30 day Manufacture warranty to cover manufacturing defects.Damage caused by improper gearing is not covered under warranty.Please check here to see if you will need to change your gearing.