Regarding large snow tires and odometer effects (300m)

Discussion in 'Chrysler 300' started by MoPar Man, Jan 2, 2010.

  1. MoPar Man

    MoPar Man Guest

    So the snow tires on the front of my 300m are these:

    Cooper Discoverer M+S 215/70 R 16

    They're not new (so maybe missing 1/16" or 3/32" worth of tread).

    Only about 1/4" clearance between the tire and shock-tower guard.

    Recent highway trip (about 100 miles) and 6 data points correlating
    highway mile-markers and odometer readings show that for every mile (or
    km) being travelled, that the odometer is turning over 0.9655 miles (or
    km). Correlation coef. for the data is .9999. Road conditions were
    dry, no snow. Speed was between 65 and 70 mph constant as set by cruise
    control (110 km/hr).

    The circumference of these tires are therefore about 3.57% larger than
    the stock or reference tire, which is 225/55 R 17.

    Speedometer correlation with GPS indicates that the speedo gives a
    perfectly correct speed reading with these tires (not an
    under-estimation as you would expect).
    MoPar Man, Jan 2, 2010
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