10x2 gear ratio
 

im running a xxx-s with a 90t 48p spurgear....the manual says run a 17 pinion that would bring my final ratio to the 9's....i run mid 6's with my 19t....what should it be running with my checkpoint 10x2

with 12 degrees timing i would start around a 8.55 fdr depending on the track layout

i have mines at 8.24 now and it runs amazing lots of top end and LOTS OF TOURQE....if i was running in mod class my club uses 4.5 and 3.5 brushless would i keep up with them?