XPost: comp.os.linux.misc   
   From: daniel47@nomail.afraid.org   
      
   On 10/12/2025 2:25 pm, Rich wrote:   
   > In comp.os.linux.misc c186282  wrote:   
   >> On 12/9/25 22:05, Rich wrote:   
   >>> In comp.os.linux.misc c186282  wrote:   
   >>>> On 12/9/25 06:53, Daniel70 wrote:   
   >>>>> On 9/12/2025 9:09 pm, The Natural Philosopher wrote:   
   >>>>>> On 09/12/2025 08:35, c186282 wrote:   
   >>>>>>> On 12/8/25 17:41, rbowman wrote:   
   >>>>>>>> On Mon, 8 Dec 2025 14:59:12 +0100, Carlos E.R. wrote:   
   >>>>>>>>   
   >>>>>>>>> No, this is intentional calibration of the car   
   >>>>>>>>> speedometer to 5 kilometres low. The reason is that   
   >>>>>>>>> if you see a road limit of 100Km/h and you do drive   
   >>>>>>>>> at 100Km/h sharp, there is no possibility of you   
   >>>>>>>>> driving just a bit above the limit and be fined. You   
   >>>>>>>>> could then sue the car maker for having bad   
   >>>>>>>>> instrumentation that caused you to be fined.   
   >>>>>>>>   
   >>>>>>>> That's the reason I've heard for Japanese bike   
   >>>>>>>> speedometers being off. The speedometer in the Toyota   
   >>>>>>>> is accurate when I'm running the 15" tires it's   
   >>>>>>>> calibrated for.   
   >>>>>>>   
   >>>>>>> Yep, tire diameter IS critical.   
   >>>>>>>   
   >>>>>> There is no 'tire diameter'   
   >>>>>>   
   >>>>>> Only circumference.   
   >>>>>   
   >>>>> .... and, as circumference is dependant on diameter/radius   
   >>>>> ......   
   >>>>   
   >>>> Exactly.   
   >>>>   
   >>>> Pi*D = circumference   
   >>>   
   >>> Yes, for a perfect circle.   
   >>>   
   >>> But a tire under load is no longer a perfect circle,   
   >>   
   >> Familiar with the phrase "Good Enough ..."  :-)   
   >>   
   >>> so if you use the loaded "radius" or "diameter" (even though   
   >>> neither really applies to a "non-circular shape") you'll come up   
   >>> short for the "distance around the outside of the tire".   
   >>   
   >> Only a little.   
   >   
   > If you plan to use that distance to measure your speed, that little   
   > will amount to a nice error in your final speed number you   
   > calculate. And this subthread got started by discussing speed   
   > measurements.   
   >   
   Could that be why the Cops allow a margin of error??   
   --   
   Daniel70   
      
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