Hoping someone out there knows if a 245/45/18 will fit on my 2004 A6 S-line? Factory was 235/45/17 and i currently run a 235/35/19 both of which are about 25.3"-25.4" overall diameter. Will the extra inch of the 245/45/18 rub? Found a good deal on some used snow tires/rims and dont want to schlep an hour+ away only to slap em on, take one turn and hear that awful sound.....[:'(]

thanks in advance

 

An inch is a lot when you are making sharp turns or your vehicle fully laden. I wouldn't go for that. 35/R19 is still ok, but 45/R18 is not.

 

That was muy gut feeling too, i was just searching to see if it had been done. Sux b/c this guy has 235/45/18 snows w/ <2k miles on them and equally new RS4 replicas that would look pretty sweet for a winter set upand only set me back 6 bills. If anyone else out there has done it successfully please let me know.

 

235/45/18 will fit fine if the rim offset is correct. ET38 thru ET45 offset should work fine. I have 235/45/18 ET45 on mine with no clearance problems. Check with the seller to find out what the offset is.

 

thx, will do.

btw, Daroshi is your speedo then off by about 4% too?

 

4% is absolutely correct. When the speedo reads 65 it's really going 67.62 mph. But it looks much faster

I usethe handy tire size calculator in the attached link. It will compare the original size with the new tire dimensions and even tell you what the speedometer error will be.
http://www.discounttire.com/dtcs/infoTireMath.dos