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5128Re: [solectria_ev] Re: New and Old Tires Review

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  • Ken Olum
    Apr 3, 2009
      >I have a Geo Metro Convertible and installed Kumho Solus KR21, 175/70-13. The
      >original tires were 155s as well. I found two different programs that
      >calculated about 8% slower rotation of tires due to the larger diameter which
      >results in a slower spedo and odometer.

      I'm confused. Did you have 155/80R13 before? I thought (see
      http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=46) that
      the rim-to-tread distance was proportional to the product of the first
      two numbers. 155*0.80 = 124mm, 175*0.70 = 122.5mm, nearly the same.

      In any event, wider tires (175mm vs. 155mm) don't seem desirable. For
      efficiency, you want narrow tires with lots of pressure, like a

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