come to the open practice tomorrow at coral spgs. We will help you get sorted, You only really need 1-2 spurs depending on what classes you want to run. Pinions are more important by a mile. for usgt it is the Gravity rc motor as spec and try to get to to 2.7-3.4 and do it with pinions. A 80 t spur will be good. buy all the pinions in that range so when the track layout changes you will be good.