I don't have any 48 pitch spurs or pinions so i modified the smallest tamiya spur 90T by reaming the center hole to 10mm and then pushed in a 6x10mm ball bearing and some shims on both sides of the spur so the ball bearing can't come out of the spur. This brings me closer to the FDR you guys are using with a 17.5T motor,1 cell lipo and boosted.
Maximum FDR in this configuration is 1.94 (90 spur with 47 pinion), that's the biggest pinion/smallest spur combination that can be used.
So far i don't know anything about roll out things (still to find out/learn
) but i gues it will show itselfs on the track if a bigger pinion is needed or not.
Tomorrow will be the first time i try the car with a 17.5T motor&1 cell lipo, track is a medium sized one