I have found that typically spedometers on bikes read 5-10% fast. In 1976 I owned a Suzuki 750 (water buffalo) and a friend of mine was a cop. Radar at that time showed 55 when the spedo indicated 73. It's closer today, traffic flow around patrolled areas is about 5% faster that posted . Haven't done a radar check yet but plan on it. I would tend to agree with the GPS. my GPS (Garman) matches our car on trips but haven't tried it on our AN650.
I have used a Garmin E-trex Vista with my car and my Volusia. It consistently indicated about a 10% differential. My research has indicated the the GPS is true MPH. Have not yet installed the GPS on the Bergy.
I also have a portable GPS. I haven't checked speed with it, but now I'm going to make it a point to do so.
I too have passed those police radar checks, but they have never matched my indicated speed. They have always shown less than what I'm indicating - sometimes more than 5mph less. As a result, I have been wondering if my speedo is accurate... One thing I was thinking is that perhaps because the profile of the bike is so small, that it can't get an accurate reading. Anyone have any thoughts on this?
I'll try to post my GPS results here too, to add to the data....
Have a Burgman 400K3 with 850 miles on her, I checked the speedometer when I first got her and found in to read a little fast compared to my GPS I had a Honda Reflex before the 400 and I had checked it as well and found it to be very close to the GPS at speeds below 50mph but when I got the Burgman 400k3 car's were passing me a lot more on the route that I always take which is 2 lane so I brought my GPS with me one day and found the speed of scooter to be 5+% fast at most speeds but it reads very close to my friends Honda Helix and his Honda Rebel. There seems to be a little more tire slipage at high speed.
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