[i4n]

Sensible answer - I don't own that car but so people can give you a sensible answer try adding information such as:

1) Size and type of track (big, open and flowing/short and twisty/combination of both)
2) Is it indoors or outdoors
3) Big jumps, little jumps or no jumps
4) What is the track surface (carpet, astroturf, grass, ice)
5) What size Spur are you using
6) What type of tyre will you be using
7) Is is a bonded or sintered rotor in the motor

Stupid answer - if you put a bigger one on it'll go faster but accelerate slower and if you use a smaller one it'll go slower but accelerate faster.