Need Help with Pinion gear sizing

I am putting together a HCR Mutant Maxx Chassis. I just got my MMM 2200kv and am mocking everything up. I noticed that the 18t pinion they send isnt anywhere close to the correct mesh. The chassis uses a CD from a GS Storm. The spur is 46T and I dont want to run too much gearing. What would be a good size pinion for plenty of torque. I appreciate any help!!


Jacob