The Holmes Hobbies TrailMaster Sport 550 Brushed Motor 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 direction
• 1/8th inch shaft diameter
• 36mm OD x 57mm length (not including shaft) 
• m3 mount holes, 25mm spacing, "540" standard
• ball bearing on output side
• bronze bushing on end bell side
• High strength Y45 Ferrite magnets