Austin, I ran a 15/68 last week ( ratio wise about the same as my 14 tooth driver set up) and I was a tick faster- waaay faster through one and two, couldn't hold the speed inbetween 3-4 as my exit into the tire wall outside of 4 on the white flag lap would attest. There must be something to this "big driver" conspiracy theory... but ratio wise I think you're shooting for a 4.5 with an animal here BTW, I spun 7300 RPM with the 15/68, was dropping 1000 RPM thru 3-4
