18x9.5 +12

72bluNblu said
It's the brake kit, yes. The DoctorDiff 13" cobra style rotor kit adds about 5/16" to the track width, or basically 5mm. I'm not sure if its the hubs or the rotors or where it comes in. Andy's original Viper kit added like an extra 1/2" to the track, but that was before the aluminum hubs that are used now.

I've spoken with Cass about it, the current 13" kits only add 5/16" compared to the track width of the stock 73+ disks (although that track is wider than the SBP cars). I try to always give my offsets relative to the 73+ factory disks.

Gotcha. Sounds like the hubs that Cass sells aren't a direct swap for the one's Andy used then. Good to know.

goldduster318 said
...and a rim under 18" you have to worry about tierod clearance to the rim and tire, which in most cases forces a smaller tire width.

Honestly I would have gone with a 17" rim if the tie rod wasn't an issue...

I wonder if that was the other (only?) reason Andy pushed the face of the hub out some? So the tie-rod would clear.

So far I am ok with my 17x8's and +24mm offset, but not by much. If I want to go to a 275 (someday) on the front, probably going to have to step up to an 18" wheel.