thumpin15s-
Single's having just one wire wrapped around the armature will allow for more torque
Doubles have good torque and are a lil smoother and faster
Triples-These motor's have 3 wires wrapped around them weighing more causing less torque but are smoother and actually have a HIGHER RPM than singles.
Quads are great for slippery tracks or for someone racing mod that doesnt have very good throttle control.Still good torque but just a smoother throttle response and great RPM.
Les