Race Tire Size

[Whitehot]

I was wondering if theres a chart, or something, based on how much HP your making, giving you an idea of what DR tire size to run??... Based on 15" rim ...maybe like 510 - 540 RWHP ?? hopefully in that range?? ;)

[NickD]

Lots of variables, gearing, trans final drive etc.
Generally a taller tire will offer a larger contact patch, but that will also lower your gearing. Most important is trying to maximize your gearing so your near redline and in the powerband at the traps.
I run a 26" 275 radial on my s197 which is an inch lower then stock and increases my 4.10s to closer to a 4.30 gear. Im trapping at the end of 4th.
3.55s and 27" tire I was just running out of 3rd.
On s197s most of the guys in the 500+ range run a 28" tire for the extra contact patch and more sidewall which flexes easier absorbing more driveline shock.
On a new edge your stock tire height is smaller I believe so this will be different for you.

[Whitehot]

runnin 275/60 / 15 now.. almost thinkin they re little to big... 410 gears.. blah blah lol....Did run them once on old set up... gettin excited bout New set up ;) ..