Weather you are an 1/8th scale racer, 4x4 SC or Monster Truck person, we have some motors for you. 550 size motors are longer than the normal 540 motor and produce more torque because of that. This also lets them run cooler. So if you have a 540 motor that is getting hot while you are pushing the limit, step up to a 550. If you have larger trucks or truggies....we offer the Toro 1/8th scale combos which include ESC, Motor and Programing card. These motors usually have a 5mm shaft, so check the listing carefully to ensure you won't need additional items.