Around here the speed courts do just that if you bring it up. They allow
a 5% variance in the amount the radar reads or officer states. That
sometimes can make a huge difference in the fine or the points on your license.
Mark
In a message dated 7/5/2010 3:45:36 P.M. Eastern Daylight Time,
atwittsend@verizon.net writes:
The other side is that at speed the circumference of the tire can possibly
grow from centrifugal force. A grossly exaggerated example are the rear
slicks on a Top Fuel dragster. So, the static measurement might just be
the
best "averaged" measurement.
Interestingly in Fred Phun's book "How to make your car handle" (page 119
-
at the bottom) it states that manufactures allow up to 7% variations
regarding tire dimensions for a given size (Tire & Rim Association, Inc.).
That 7% is equal to 2:88 gears becoming right about 3.07 gears if you are
changing tires from both extremes of that 7% limit.
By the way, I always thought the 7% factor would be a good argument to get
out of a mildly over the limit speeding ticket. :-)
Tom (Witt)
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