The 2006.5 Kia Optima rides on a MacPherson strut front and multi-link rear suspension with stabilizer bars at each end. An engine-speed sensitive power rack-and-pinion steering system guides standard P205/60 tires wrapped around 16-inch wheels or optional P215/50 rubber mounted on 17-inch alloys. Base LX models get steel wheels decorated with surprisingly attractive wheel covers, while LX V6 and EX versions have 16-inch alloy wheels as standard equipment. Cars equipped with the optional Appearance Package get the bigger 17-inch wheels. These wheel-and-tire combinations front a standard four-wheel-disc braking system, vented in front and solid in the rear.