Well thank you for the info. I was talking to a friend who got a Suzuki Swift, that pandithaya has fixed 15" for that too. And now he is crying about lose of comfort. But for that we can say the car is not fit enough for a 15".
Also I got a friend who got a VIRS, well he got original set of 15" where he claims he got no issue, but then again he got sports suspension.
So what I understand now is that when we have to put up a increased diameter of alloys we got to modify or upgrade the suspension as well. Which of course will cost another extra thousands....
The Vios is quiet all right in comfort, I think for the price we paid, which was nearly 2.5mil at that time it was still over priced but it had lot of geniune mods from indicator meters, body kit, spoiler, 17" alloys. I have to check if the shocks are modified accordingly. And i think it should be becuase the ride is smooth