Over the last several years, more and more car manufacturers have been offering larger wheel and lower profile tire options for new vehicles, even on lower-optioned models. Beyond the cosmetic appeal of a larger wheel, the accompanying lower profile tire is normally focused more on high-speed handling and grip - which makes the larger wheel option very popular. From standard 18" wheels and tires on a Toyota Camry to standard 22" wheels and tires for the Ford Edge, more vehicles come equipped with unique sizes that are often in short supply when they need to be replaced. If you're frustrated that the low profile tires don't provide the comfort you desire, we can help.
Besides our years of experience in "plus sizing" vehicles for performance tires and wheels, we can also offer "minus sizing" options for many vehicles. This allows you to move away from low profile / high-performance oriented tires and towards a more comfortable ride and better durability. While most often this practice is done when selecting a Winter / Snow Tire & Wheel Package (where a taller and narrower tire can help with protection from potholes and enhanced deep snow traction), we can also apply the same information to find a smaller diameter wheel that'll fit safely with the appropriate tire size to maintain speedometer accuracy for most applications. Not only would deep snow traction be enhanced with minus sizing, but the cost of the Tire & Wheel Package is usually lower than the package maintaining your vehicle's original size tires and wheels.
To gain a better perspective of minus sizing, read "Size Selection of Winter / Snow Tires."

TireRack doesn't have a very good selection of narrower wheels.
As an example, the Civic should be able to use 185/65 15 tires (see Nissan Versa), those tires should be on 5.5" wide wheels.
I have civic coupe got 16 inch but i will 15 to improve ride quality
The switch from 16" to 15" would probably not make a huge difference, but if you also switch from a high performance tire to more of a "touring" tire that might help as well.
A narrower tire will compromise that car's lateral stabilty (at high speed), so we would not encourage minus sizing if you consider yourself an "enthusiastic" driver.