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Re: Speedometer Accuracy

I also use a GPS and the bicycle speedo and they agree and I believe they 
are accurate.  Pete
- ----- Original Message ----- 
From: "Bob Hadden" <kbhadden@xxxxxxxxxxx>
To: <oilheads@xxxxxxxxx>
Sent: Thursday, June 02, 2005 4:17 PM
Subject: Re: Speedometer Accuracy

> Pete,  I have done just that on my new GS.  Haven't found a way to confirm 
> the accuracy of the bike speedo yet, but it reads about 2 mph below the 
> bike speedo.  I was very surprised at that.
> If one has GPS on the bike, is the speed display super accurate at any 
> given moment?
> Bob Hadden '05R12GS, '62R27
> On Jun 2, 2005, at 8:48 AM, Pete and Nat Lavengood wrote:
>> BMW Designs the speedos to read high. The intent is for the speedo to 
>> always read high even with the largest possible tire mounted on the front 
>> rim. They will not recalibrate as it is supposed to be this way. 
>> Inexpensive and accurate solution is to get a bicycle speedo using a 
>> magnetic pick-up mounted on the brake disc. This unit is calibrated to to 
>> the tire on your bike. ie mark a spot on the tire and the pavement, roll 
>> ten times and measure the distance between spots and divide by 10. This 
>> is an accurate circumference of the loaded tire and is entered into the 
>> bicycle speedo to calibrate it to your bike.
>> From: "Gregory Appling" <gappling@xxxxxxxxxxxxxx>
>> To: <oilheads@xxxxxxxxx>
>> Sent: Wednesday, June 01, 2005 10:32 AM
>> Subject: Speedometer Accuracy