I had 225 40 18's on my A for a while, say 25k miles speedo as stated was way out but i sat nav so after a while you get to knowing how fast you're relly going. Disadvantage is you colck up more miles than you've actually travelled.
Not had any quatrro issues (as yet) That said i have fitted 245 45 18's for a while now and the comfort level is far better. 40 profile of 225 is way too small pot holes and bumps are a mightmare. Cost me 3 cracked RS4 replicas and top arms took a hammering. Quick off the mark tho.
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