I am looking to see if anyone has ran the following set-up with staggered 22's?

I recently purchased the GTS Concaves from Wheel Dynamics and went with 285/35/22's (Front) and 305/35/22's (Rear) which is 5 tenths of an inch apart in overall rim diameter VS running 265/35/22's (Front) and 295/30/22's (Rear) which is 3 tenths of an inch difference and I am feeling a vibration from 60 to 80mph while cruising and when I apply the brakes this stops.

After speaking with Wheel Dynamics, it was suggested to make sure the rear wheels are still balanced properly because a weight has the potential to fall off through the shipment process.

With this all being said, I am taking them to a local shop to have this looked at but does anyone think that my issue is related to the difference in diameter or simply a weight or even the Cardan shaft.

Thanks for the help.

 

i have a slight vibration in the steering wheel between 70 and 80 on my commute, yet not everywhere...

thought of re-balancing until a co-worker told me he has the same thing happening with his Q5 on some stretches (???) ...

safest bet is new balancing.

 

I actually increased pressure to 50psi in the front and dropped the rears down to 32psi and noticed a huge difference. I planned on taking the wheels to get re-balanced but I think i solved the issue with proper inflation. Prior to making this adjustment the wheels were at 45psi all around.