just got a city vaio myself 3 weeks ago. did a lot of research on this issue.
i went to 4 top tyre shops in lahore and ALL of them said that there is no need to upgrade size from a 13" rim. people only do it for show, and it will reduce fuel consumption and is not good for shocks/suspension. 195 width may also be bad for your fuel consumption. In my opinion, you have two choices:
1-stick with 13" and get 185/70/R13.
2- it is nice to get a bit bigger rims though. i checked the honda malaysia site and there the city is sold with 14" rims. so go for 14" rims, and get 185/65/R14. if you really want 195s then go for 195/60/R14. This gives you an even narrower sidewall height (of 117) These are the tyre configurations that are closest to the original (165/80/R13). visit this site for info: http://marksink.com/tire_wheel_offset/tires.html
15" rims is too big for this car.
If you want the look, for for the 14" rims. You won't regret it. the 185/65/R14 will give you a slightly softer, more comfortable ride, and will be lighter on fuel.
The 195/60/R14 will give you a tighter more performance ride and will be slightly more on fuel. Remember though that tighter more performance rides are for smoothly paved roads, which are a rarity in pakistan.
take care bro.
always just don't change the dia of rim..always go with companys prescripted size....using 14" or 15" can show incorrect RPM and can cause ur engine and other stuff to be run on some more load resulting decrease of life of gears and other stuff....thickness can be increased but it can decrease just ur fuel avg..nothing more...
so i suggest get 185/70,60/R13