<VV> GPS error> Tires & Speedometers

[BBRT]

Which is well within the error range of commercial GPS'.  Frank, you could 
drive several measured miles and compare your GPS to see how accurate it 
really is. Keep in mind the mile markers are not necessarily accurate as one 
would like, so one needs to find a measured mile, etc.
Chuck S
----- Original Message ----- 
From: "FrankCB" <frankcb at aol.com>
To: "Chris & Bill Strickland" <lechevrier at earthlink.net>; 
<virtualvairs at corvair.org>
Sent: Wednesday, September 23, 2009 3:46 PM
Subject: Re: <VV> Tires & Speedometers


> Bill,
>     Why not just hook up your GPS unit, drive the car on a straight road 
> at steady speed with little traffic and read the GPS speed?  My Garmin 
> 255W (thanks Jim) tells me my speedo is about 2 mph FAST at 65 mph.  So 
> it's a little optimistic, just like me.<GGGG>
>     Frank "looking for easy way out" Burkhard
>
> In a message dated 09/23/09 15:35:54 Eastern Daylight Time, 
> lechevrier at earthlink.net writes:
> [SNIP]*IF* it is important to you, you could probably do better by 
> figuring
> out what tire circumference gives your particular speedometer head the
> greatest accuracy, and/or by sending your speedo head out to a shop and
> get it "Certified" (used to need the whole car to do this - $$$) or at
> least calibrated, and/or by having a speedo shop build you up a  "ratio
> adapter" to give you a correct speed  for your speedo and the tires and
> gearing that you choose, rather than making tire size choices based on
> someone else's idea of how your speedo should read and what your car
> should look like.  Then when you put on your "winter tires" (for those
> that drive year round), you just change the ratio adapter, too.
>
> There are many shops that provide these services -- just one example is
> http://www.speedometerservice.com/services.php
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