Max tyre width on standard 16" rims?

[Ratty]

I'm due to fit new tyres on my standard 16" rims.
At present 205/50X16 are fitted.
The tyres I want to fit only come as 225/45X16 or 245/45X16.
I'd like to fit the wider ones to get a longer rolling circumferance rather than a shorter one, but will the wider ones will fit?

[Kit]

they will fit but you will get increased tyre wall flex i think?