Not sure if Im on board w/that opinion. Can this +30 setup do what is in the pic below?

If it cant, then IMO, it does not fit. Not throwing stones, just want to make we are clear on what is considered true, clear fitment w/out any potential of rub

 

For a while, I was on MR Bilsteins with GTWorx springs with otherwise stock suspension. Front camber was -1.4 deg and rear was -1.2 deg. +35, +32, and +30 mm all worked with no rubbing. The GTWorx springs produce a fairly mild drop (<1 inch at the front and maybe 1/2 inch at the rears), so that may have helped with not needing any rolling.

Now I'm on Ohlins R&T along with an offset rear pivot for the front control arms. The offset pivot kicks the front wheels forward and outward slightly. Camber is -1.9 deg at the front and -1.5 deg at the rear. The car is dropped a bit more as well. Probably 1.25" at the front and 1" at the rear compared to stock. Zero rubbing issues with +35 and +32 mm. I have not tried +30 mm, but I think it wouldn't rub either.

I have not ever tried checking clearance with springs or shocks removed, but I'm on very light spring rates with the R&Ts (7 kg/mm at all corners) and I routinely transport my family of four around town and have never had any rubbing issues at all.

Keep in mind the fact that I'm running ASUHP that do run a bit more narrow than max performance tires. I could imagine that a max performance 255 could require +35 mm offset to clear the fenders (and would probably just barely clear my R&Ts at the front).

 

Has anyone figured a way to change a coefficient in the ECU to change wheel-diameter (gearing) so that the odometer/speedometer will be correct with modified overall tire diameters?

 

The ECU does calculate the speed displayed by the speedo.

 

So can we reflash it if we change tire outer diameter?

 

Sorry, I meant to say that the ECU does not calculate speed shown by the speedo. The speedo has some independent method.

 

I currently run Michelin Pilot Super Sports, on 17x9.5 +32 Weds TC105Ns.. these tires run very thin. I wish I would of went with 265/40s. Car is currently on Swift Spec Rs. No rubbing at all. Camber is at -1.8 F, -1.5 rears.

just showing comparison and optional other tire if you wanted to run the wider size you mentioned earlier but on a different tire.

I will lower the car a tad bit more once I get some Fortune Autos later this summer.

pics below to show how thin they run..