Would the 315s be too much for a stock Redeye with 2.62s? My best 60 on the 305s so far is 1.474. I am hoping I can get into the low 1.4s
I have never run the 305 tire but I have run the 315 w a 2.62 as well as a 3.09 gear.
I had a best of 1.48 w the 2.62 gear and so far I've been 1.46 w the 3.09.
Different tracks but similar DA of 600'.
This doesn't directly answer your question but it's at least some real world info for you.
Also, it appears that their is a difference of around 7 lbs ea between the 305 vs 315 tire. Obviously 14 lbs of rotational mass is theoretically worth some et.