u/martinheyhey

I have purchased some Q7 alloys (20x9 ET28) to replace my A6 rotors (20x8.5 ET45) and I need to know what will be the correct bolt length?

I have found out that I need bolts with a 14mm rad seat instead of the 13mm rad on the A6 but I can’t find a definitive answer on bolt length.

It seems to range from 30-37mm which I appreciate can be down to the thickness of the wheels central hub and the hub on the car.

Ideally, it would be nice to know without me having to remove one of the current wheels to check bolt length behind the wheels hub when compared to the new alloys.

Part no for new alloys: 4M0601025BQ

TIA!

Looking at replacing my very faded and worn rotors on my A6 Avant. The rotors are standard (20x8.5J, ET45) but want something around the 20x9J, ET30 size to reduce how much the alloys are tucked in.

Anyone able to photoshop these alloys on my car?

Any alloy recommendations are welcome 🤗

Thanks!