Quote:
Originally Posted by converted
Ok so i have a 12 ss and a 13 boss. I auto-x once a month. The ss i awesome in the grip department. We have some suspension mods coming later to help a little with handling. The tire question is more related to the boss tho. (Ford forums suck!!) question is if i go from a factory stagger using a tire like pirelli, to a squared set up of a tire like bfg rivals or full on race slicks. Will going just a little bit smaller hurt the tire so bad that it would not be worth it? My factory rears are a 295/??-19 and i can find stock gt wheels in 18 and 17 all day long pretty cheap but they are a little bit width restrictive. So i guess im wondering what the opinion is if i was to try say an 18x8 ish wheel with either a bfg rival or full race slick do you guys think it would stick and handle better than stock wheels with summer tires such as pirelli p-zeros?
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I didn't see this until it got moved into the forum for all the dedicated corner-carvers.
I pulled up the Tire Rack data for 2013 Boss tires and it gives 255/40-19 on 9" front wheels and 285/35-19 on 10" rear wheels as the stock sizes.
Unless you're specifically planning to run in F-Street/F-Stock, you might as well plan your wheel size & width for whatever class you might end up in, or for what you might want to run on the big tracks if that's a possibility. ESP is arguably the best place for an "unstock" Mustang, and that gives you a bit of latitude with respect to wheel sizes. Terry Fair (Vorshlag) has a 18x11 Forgestar fitment that you could legitimately run tires as small as 275/40 on . . . or 295/35-18 BFG Rivals for that matter. There are a couple of caveats - front and rear 11" wide wheels are different offset, and you'll need some minimum amount of negative camber that might be tire-specific for actual tire dimensions. He even has an 18x11/18x12 package.
I wouldn't even think of looking at anything narrower than 10" here, and probably not below 9.5" for street-only driving any more. These cars aren't all that much lighter than the 1LE or Z/28 so you shouldn't expect to be able to successfully run rims that are too much narrower without leaving too much on the table.
Michelin Pilot Super Sports
Hankook RS-3
BFG Rival
are three of the tires I'm looking at mainly for HPDE and for either 18x10.5 or 18x11 wheels, for the car in my avatar. for the upcoming season.
Terry Fair and Sam Strano (stranoparts.com) are probably the top two vendors I'd contact for wheel and tire recommendations for autocrossing, Terry being a good bit more involved with running on the big track.
Norm