@Storm, @vitzrules, @tyrone_40
First of all thanks a lot for you all for your concerned replies.
it seems to be comming from driving seat side door shade, or somewhere near about, not sure.
also i felt it when going to murree and raced it over 90kmph. But anyways it seems harmless, though not sure.
Sorry its my mistake i should mention it chain, i did belt instead, I changed the belt which runs all over the engine, it was cracked. I bought that for 2800/- at that time.
I think i'll go for;
175/65R14=583mm (a little tall but acceptable)
185/55R15=585mm (a little tall but acceptable)
as my car is little low and its hitting speed breakers.
No there was no bubbling at all, drive was smooth it was just that noise which was annoying me, it might be harmless.
thanks a lot for your explanation about typre sizes i may have missed it in forum.
Just one more thing which is annoying me whenever i turn the AC on and push accelrator slowly i hear a sound from engine. AC cooling is fine.