You can go with a 215/55-18 but that is the only other size that will be acceptable.
235/50R-17
225 / 50r 16
215 50R-17
look in your owners manual or on your drivers side door specification tag and it will tell you.
Yes , you can replace a 205 50r 16 with a 205 60 r 216. You must replace in pairs, not a single tire.
It is 110 km/h
Yes...assuming width and backspacing is not an issue a 16 inch wheel diameter is only half the equation. Overall tire diameter is the real number to look at when going to a larger than stock wheel size. +1 and +2 etc. sizing will come into play, for example: 205 60R 15 stock size, 215 50R 16 +1 sizing and so on.
2(5r + 6)(5r - 6)
You can but your speedometer will be off. The 205/50-16 has a diameter of 24.1 " and the 205/55-16 has a diameter of 24.9". That is a difference of .8". I suggest you stick with the OEM size. Click the link to see what effect different sizes will have.
Yes. Since you want your breaker to be less than the maximum rating of the receptacle this would be fine.
Yes you can use 205 60 r 16 tires in place of 205 50 r 16. They are only slightly higher.
A 14-50R range receptacle pin identification are as follows. U shaped slot, ground wire. Slot Y, red wire. Slot X, black wire. Slot W, white wire.