I race on a huge 1/8th track on some weekends then small 10th tracks otherwise. Very different.Randy Pike from Tekin recommended I try around 7.9 fdr for the small track. I got the RPM motor. I worked it out for a 72 spur and then the pinion wouldn't reach. So was hoping someone had a table somewhere. To save me the annoyance of changing pinions and Spurs not knowing if they'll fit.
I suppose if I stick to the Spurs you recommend I'll work it out pretty quickly. Thanks.