I have a 2002 Audi A6 2.7T with Tip., i was wondering what size rotors i have since there is two different sizes 315mmand maybe 321mm, having to buy pads and it came up with 2 different types. Thanks for the help. And how can you tell also. Instead of having to take off the rim.

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2003 Evo VIII
Turbo-Back Exhaust (cat-less)
Injen Intake
Injen Upper IC Pipe
Slowboy Racing Intercooler
Slowbpy Racing Lower IC Pipe
Forge MBC
Forge DV
Megan Header
Exedy Stage 1 Clutch
Gruppe-S Lightweight Flywheel
Tuned by Me

Your rotors are321mm. As for pads you might have to check...most 2002 2.7T'shave 4 pad HP2 calipers,but I have heard of some out there with 2 pad ATE calipers.

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2002 A6 three.oh