Buddy, go for either 185/70/r14 or 195/65/r14, as in both the size the rolling radii remains almost same with negligible difference . Considering the way Swift behaves on bad roads, I never recommend anyone to go for 15" since it definitely affects the ride quality. The later one will give you maximum comfort and improved overall performance and even I am going for these tires on my Dzire. Oh also I have seen that 195/65/R14 are only available in Yokohama A drives as per my research, not sure if there is any other brand manufacturing this size. Good luck!