i have a kodiaq on order and i want to change the elbrus 18" wheels immediately ive never done anything like this before so i dont have a clue ive heard that bigger wheels has to mean lower profile tyres otherwise the speedo wont work correctly  and that lower profile wheels means a more uncomfortable ride?? I know the tyres need to be lower to allow the wheel to fit in the arch but the arch looks pretty big.....   I would like as big wheels as possible really without pa