Opel Rak E Concept

  • BMW i Launch Event, Frankfurt, July 2011

    There are many unusual things about the BMW i3 Concept electric minicar revealed last month, including its glass doors and roof, not to mention BMW's first production battery-electric powertrain. But the BMW i3 is also at the leading edge of another efficiency trend: tall, narrow tires that reduce the vehicle's wind resistance compared to the usual short, wide tires fitted to cars today. Fitting low-rolling-resistance tires to a line's most efficient models is now de rigeur. Over the years, these harder, lower-friction tires have gone through several generations, so that's today's versions...

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