[Ferrarimx5]

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The GPS lags a bit behind the Speedo, but catches up and is dead on at a steady speed. Checked it going up and down a bridge and the GPS only measured forward distance traveled, the Speedo measured the amount of road rolled under the tires.



I tested the Speedo at a constant 25MPH.. Then at 30... Again at 40 and 50 and 55 and also at 65 and at every speed I tested, the GPS agreed with what the needle on the Speedo was reading. In every case it only took the GPSa few moments to find and lock onto the MPH.



Just wanted to let everyone know that with new tires on my 1992 Aspencade the Speedo is 100% correct as checked by my GPS.



FerrariMX5

 

[Dusty Boots]

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Ferrarimx5 wrote:

Just wanted to let everyone know that with new tires on my 1992 Aspencade the Speedo is 100% correct as checked by my GPS.

What kind/brand of tires might that be? :baffled:

 

[Ferrarimx5]

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Unbelieveable as it seems they are the DURO Tires.

FerrariMX5

 

[GSMacLean]

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I've done the same with my 27 year old GL1100, and it has the most accurate speedo on it (checked against GPS) that I have ever seen on a vehicle of any kind.

 

[chris in va]

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Yup, my 83 is spot on with my Garmin. Not so my Maxima or Cherokee.

 

[exavid]

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It's the 1200s that seem to have the most inaccurate speedometers. My 1500 speedo is as close as I cancheck with a stopwatch on a measured mile which is a more accurate way to verify a speedo than even GPS. BTW my GPS also agrees with the speedometer. I've noticed a couple 1200s that had around 7-8mph error at 70mph. My 1100s all seemed pretty close to the mark on the GPSthough I didn't verify them with a stopwatch.