I need to replace my front passenger(right) wheel bearing but not sure what hub size I have!! I have a 01 A6 2.7T with 16" wheels. I just recently did my rear brakes and they had a problem with the rear hub size. I bought the right rotors(255mm) but guess my hub was smaller and that cost me a lot more. Went from $25 per rotor to $60 per rotor!!! Would like to buy my own parts again since it saves me a ton of money!! Thanks for the help!!!

 

There are two different one's listed for the rear of your car. Both are 255 MM dia but they list a 48.1 and 54.1 height.

There is only one size listed for the front.

 

I went to Napa to check on the part and they didn't even have a different size for the front wheel bearing! It shows same size for the 2.7T and the 2.8. After the whole brake mess trying to aviod it happening again!!!

 

Im not sure if this is exactly what your looking for, but the outside hub the wheel slides on to is 57.1mm, front and back.