in india it is suggested to upsize only by an inch, so that'll be 15", you can even go for 16" but the side profile will be less and hence your riding comfort will be worst, low profiles are meant for smooth and flat roads, but in india we have all stupid roads with potholes every where, on 16" if you get into a pothole, your rims temd to break, so better stick with 15" upsize, go for 185/65 r15 or 185/60 r15, these should serve your need and not to forget, if you watn performance then go for, michellin pp2 or bridgestone potenza g3 or yokohama s-drive