Is there a way to tell if I have 245mm or 255mm rear rotors with out measuring the rotors on my car? I would like to purchase some OEM replacements from ECS Tuning I have an 02 A4 1.8T Quattro. Thanks for the help, Jon

 

you need to measure them

 

LOL get a ruler... better yet, don't buy them from ECS. You can get new rear rotors for under $40 a piece at your local parts store.

 

Reason I was looking at ECS is because they have slotted OEM replacement rotors.

 

aesthetics look good but they wear pads quicker

 

I am aware they wear pads quicker. But slotted rotors help with heat dissipation, which helps from warping rotors.