Hello, Gareth thank you for your reply. Very much appreciated.
I brought this car modified, perhaps a bit naively liking the looks of the car not knowing I could bugger the alloys so easily. The Alloy's are rs3 alloys 19", which technically, are aftermarket, even though are they are from an Audi, the a3's generally only go up to 18" from the manufacturer as I know so technically 19" shouldn't on the car. Right now the tyre's I'm running on those alloys 215/35/19, rather than the recommended 235/35/19 (I was wondering if this was an issue) , I'm not 100% sure why 215's are used, but from browsing around on other people fitting 19" to a3's I assume its perhaps for clearance issue's because of the size of the alloy or something or how low the car is. I wanted just to make this car practical for day to day and not have to worry about as much of the road surface. Don't get me wrong if you hit a pothole you expect to maybe have a problem, but its just everywhere near me has them and if it keeps happening it's going to be an expensive bill for me.
At first I was under the impression I could use a thicker profile tyre such as 235/45/19, but that is not good idea is it? As your putting a tyre on the alloy that it isn't designed for. When I got the alloy off and found the crack, its had several repairs before, I'm concerned now as I just want my car back on the road and make it practical. I know a good welder who repair the alloy, but it does make me question if I'm fixing the underlying problem here and as much as I enjoy the looks of the car it's just going to give me a headache. I'm not that bothered about performance I was more interested in the styling, but I'm considering as you say establishing the OEM alloys that fit the car and just getting them put on it.