Originally Posted by
mxracer458
Our local track is running no timing class now for 17.5,I know some guys said 72 spur with a 32-34 pinion,the guys at my track are running 75-30 in there trucks.with a 72 I know I'll have more speed but will I have the
Bottom end also
72 is for the buggy. I read back a few pages the 78 was the spur to run. Ask around at WCRC, there are lots of people to help.