Hello Gareth,
Thanks for taking the time to not only reply to my post but also giving me a real world view and also giving me lots of things to think about before I decide to make such a choice.
I have a 2016 facelift Audi A3 s line, and they came with 18 inch alloys from new. I'm not sure about the exact tyre dimensions as I haven't had to change the tyres yet in my ownership and I'm not near my car at the moment.
There are two reasons I wanted to upgrade to 19's firstly I wanted a more sporty feel while driving, secondly, they'd look so cool and lastly, the alloys I was thinking about buying only come in 19's however, I'm not sure if it's worth getting a bigger alloy hence why I'm after some opinions and ideally some advice from people who have done it.
Thank You,
Habib