Devil_Inside

I need to start looking for a set of tires for my new Hartmann RS6 wheels, and I am a little bit puzzled about the size. The wheels are 18" so technically I should go with 255/35/18, but Hartmann recommends 255/40/18 for better comfort and pot hole protection. I am not concerned that the speedometer will be reading by 4% off, but I am worried about rubbing issues. The car has been lowered by Eibach Pro springs, and if I am not mistaken I get 1.2" drop f&r.

Would I have a problem if I decide to go with the 255/40/18's ?

Boston Driver

...and I would expect a bit of rubbing since your car is lowered.

Devil_Inside

I was planning to keep one of the "pie plates" for spare, but now when I think about it I can only go with 255/35/18 if I do that, otherwise I will have different diameters, which can't be good.

I am just concerned about the 35 sidewall - I think this is too little rubber for such a heavy car and out "wonderful" Massachusetts roads. I bet the ride comfort isn't great either...

Boston Driver

...gotta wait for the potholes to be fixed!!!

Devil_Inside

I avoid them like the Plague!

Devil_Inside

"Hi Kalin, a 255-40-18 is our more common tire fitment for the A6 4.2, we haven't had any rubbing issues with that size tire before on that vehicle though I don't know for sure if any of our customers have Eibach pro springs on. From my experience I don't foresee any issues with using that size of tire though."

Boston Driver

I still think too big with your lowered car

nebalt

I am not 100% sure. As for the 40s, I have the same springs and run on 245-40-18s without any issues.