Pontiac introduced its first true sports car for 2006: a four-cylinder, two-seat competitor to Mazda's MX-5 (Miata). The Solstice roadster shared its new rear-wheel-drive architecture with the Saturn Sky, which arrived later--for the 2007 model year. Solstice had first been seen as a concept car at 2002 auto shows. Solstice roadsters had a manual-folding soft top with a heated glass rear window. Sole engine was a 177-horsepower 2.4-liter four-cylinder, shared with several General Motors compact cars. A close-ratio five-speed manual transmission with "short throws" was standard. A five-speed automatic arrived as an option later in the model year. Weight distribution was close to 50/50, front/rear. Motorcycle-inspired gauges and race-inspired sport bucket seats greeted the Solstice driver, who faced a rake-adjustable steering wheel. Four-wheel disc brakes and 18-inch alloy wheels were standard. Antilock braking, power windows and door locks, cruise control, and air conditioning were optional. Other options included a limited-slip differential, leather upholstery, satellite radio, and GM's OnStar communications system. Side airbags and an antiskid system were unavailable. Additional Solstice competitors included the Mini Cooper convertible, and even the more costly Honda S2000.