These roadsters included the MG Midget and Triumph Roadster. Of those, were 12 Pontiac Solstice Coupes and 8 Pontiac Solstice roadsters. Tesla announced an optional upgrade to current Roadsters, the Roadster 3.0, in December 2014. Roadsters and tourers (torpedoes) were the cheapest. The race marked the beginning of the end for the old front-engined Indianapolis roadsters. BSA manufactured a range of bicycles from utility roadsters through to racing bicycles. The BMW Z models are a line of roadsters manufactured by German automaker BMW. Yamaha began producing air-cooled "sport tuned" 250cc twin cylinder roadsters in 1959. A total of 85 SL 73 AMG roadsters were built. The later Roadsters were powered by a Ford UK Mondeo V6 producing . The roadsters and trucks built up to then had specific, targeted appeal. All models are E85 roadsters except as noted. A total of 6 CLK GTR Roadsters were built by the company. In 1962, the MG B introduced a new era of affordable lightweight four-cylinder roadsters. Both generations of the CB900F are straight four-cylinder four-stroke roadsters.