i'd like to change the standard S-line wheels on my A3, but not too sure on the 7.5J bit, as the new ones would be 8J?
Existing wheels are 18" x 7.5J, with 225/40 R18 tyres.
New alloys would be !8" BBS SR in grey, which can re-use the existing Continental tyres.
I know that the 225 is the width of the tyre, the 40 is depth of wall between tyre and ground, and obviously that the R18 is the size of alloy, but really not sure what the J bit is?
BBS SR Grey 18" Alloy Wheels - Wheelbase