Originally Posted by elex300

For that track I would start at 28/72 with 55 degrees timing. See how your temps are after 3 min of running. The tallest gear I would use on a track that size is 29/72. Anything higher and your gonna sacrifice bottom end and probably get hot. Same thing goes for a 69 spur. You dont need to gear for that kind of top end because you wont use it. Instead your motor will get hot because you are taking away the bottom end power.

This sheet was from this past weekend on a track just a little bigger then the one in your video. I was geared 27/72 with 59 degrees timing running my MM Serpent Spyder.