Looking to get an idea of rear sprockets for KA senior at these two tracks. Believe I’m running a 10 driver, or whatever is the usual. I currently have a 76 rear sprocket if that helps 
Just getting my ducks in a row for spares for next season.
I don’t know KA but NJMP is normally run with an 11. X30 Senior is roughly 11:76-78. So 10:70
E-town - Definitely 10. Probably somewhere in the low 80’s. 10:82??? Maybe higher for a KA.