245 x 45

I have them on my 2.5tdi Quattro no problems
 
Depends how much poke you have and is it on sports suspension.

I'm running 245/40's at the moment on 8.5j and it does catch now and again on the rear.
 
Speedo will be slower by aprox 5%, when doing 60 it'll be around 57 (speedo's usually out anyway though).
 
Yeah i would think it would probably make the speedo more accurate as they read fast anyway compared to the more accurate GPS way of measuring
 
marky - stock tyres had mine over-reading, that's how they design it so the car manufacturers don't get sued if you lose your license, 235/40/18's (on S4 rims) made my B6 read within 1% of the GPS at all times... 245/45's will be a significant under-read!
 

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