ah..finally got my hands on a computer so here i m replying again. i had typed a detailed answer from my mobile but i dont know when i was sending it something happened to it and it vanished. so here i go
changing of tyres, here mostly in pakistan, are just based on style...keh jee wider tyre would look good. some ppl mite not agree with it but this is the case. abt the necessity of the tyre to change, to be honest, in the new city, there is no REAL need to change the tyres as the car even with its stock tyres is excellent on road grip and braking. however, the same can not be said abt the new corolla as it DOES has few issues at high speed cornering etc etc. having said that, i personally believe that these cars, corolla OR city, are not meant for high speed cornering in the first place. so if driven properly as a economy car and not as a sports car, there are no issues with the stock tyres even. why to change then ? well...there are few reasons. firstly, they are pretty hard as compared to any good company tyre. i changed mine on day one and only drove the stock eurostars for around 20 kilometers till the tyre change shop and the moment i changed them to advan db, the difference was PHENOMENAL....that is one reason. secondly, tyres like advan db and michelin energy are built for fuel economy. so yes they do matter in the long run. thirdly, at least the advan db, are extremely quiet tyres. u just cant even imagine hoe quiet they are on the road. whereas eurostars are pretty noisy.
ok..now coming on the availablity. yes the size 185 65 is short in market so i had to source them from karachi. each tyre cost me around 1000 extra as compared to the price quoted here in pindi (if and when they would be available)..but as i m a tyre freak, i got them from karachi. also paid for the cargo. so if u want me to give u the number, i can do that
abt the tyre size, i agree with u. tehre is no need to change the tyre size at all. the only problem is that in market there are no good tyres in 175 65 size (at least i couldnt find any) so 185 65 was the closest i got to. moreover, i agree that 175 does look a lil too thin on new city (personal opinion again)
so this is all abt tyres. repeating once again. in new city, u do NOT need to change tyres or braking and cornering. both the things are excellent. yes if u need other reasons like fuel economy, comfort and noise, go for it