Originally Posted by more$thanbrains
what is a good baseline rollout for the orion vortex 17.5 motors
1/12 pan/ tight track/ carpet
A decent rule of thumb is 2x the rollout that you would run with a CO27. For example, like John Tag suggested, we used to run a rollout of 1.80 inches (~45.72 mm) with a CO27, and we're running around 3.6 inches (91.44 mm) with a 17.5. Try something around that and then adjust accordingly for your track. Check lap times and motor temps.
A 3.6 inch rollout is 1.75 inch tires, 78 spur, 51 pinion.