You shouldn't need to worry about custom gears for HPDE. That will only become an issue if you start competing and are looking to shave the last second or two from your lap times. What road course are you running? On most of them you won't see speeds much above 140 unless you're an advanced driver running a modded car on race tires.
Last edited by Jim968; 03-22-2013 at 12:32 PM.