Tires: check the condition and change them among each other
Check the condition of wastage of every single tire.
To achieve an even tire wear you can change the tires among each other, like you see it on the picture above.
Control the tire for intruded stones, broken pieces of glass or nails.
If you renew your inner tube of the tire, don't use too big patches because they can affect the balance of the tires which is very dangerous when you drive with high speed. Instead, you better renew the inner tube.