go based on the Kv of the motor. If I recall correctly novaks 4.5 is a 5000Kv motor stock, if you get one that has the 14mm rotor option, it drops down to 3850Kv .

For those looking for pinion recommendations, you may find using the following calculator useful especially if you already have a vehicle and know what speeds are good at your track.

http://scriptasylum.com/rc_speed/_top_speed.html

You can then backtrack based on the speeds you find to determine what pinion gear range to start with.

So for example out here for me the 35mph - 40mph range works well. As I am going to be running a Novak Ballistic 550 4.5 with the 14mm rotor which is 3850kv. puts me in a range of about 16T - 19T 32p pinions with the 62T stock spur.


I do have question, for those using the DS1015 servo, from the pics I have seen of the vehicle, can you guys elaborate as to why it won't reach without an extension the receiver? does the location of the servo have you going around various parts?