GPS readings vs. speedometer readings

[ebetzs]

SPEEDOMETER GPS

30mph 30mph
50mph 48mph
60mph 57.5mph
70mph 67 mph

There is some variation in these readings as the GPS takes a moment to catch up with the actual speed. Also it is difficult to hold the speedo at exactly 60mph while you are looking at the GPS>

I would be interested to know how these readings check out with you other riders.

[jlb43]

Your GPS info flys right into the face of my seat-o-the-pants (SOTP) meter. LOL

Seriously though every time I ride I think to myself I am not going as fast as indicated in spite of the fact that no one is passing me in their cages.

If the speedo is that accurate then my A500 is actually smoother on the hwy. than my Zuki. I know it is a heck of a lot more fun to ride.

I have been meaning to get the wife to clock me with the car but just keep forgetting.

[atlanticman]

I'd have to agree with ebetz's GPS except I think I got 70 indicated and 66 GPS. And as I've said before, my GPS estimates both my car's speedos 2.5 mph too fast. But looking at my GPS and the speedometer is not the best way to test speed.

[Mat]

Since there's room for 2 - could you hand the GPS to a passenger for data collection.

Just thinking it would be easier to maintian 60 if you let a passenger read the GPS.... :-)

[bccatl]

105 0n Atlantic... Garmin V GPS = 101 mph. any idea how givi will hold up? Effect on hi speed handling/ stability?

top box...Effect on hi speed handling/ stability?

[april500dk]

No doubt that the Givi box does create some turbulence you cann feel at high speeds. I´v done about 172 km/h with the box and there is a difference. I think that the vacuum between the rider and the box messes things up. But hey, it is not too bad. After a while you dont even think about it anymore..

Rock on

[bccatl]

also look at Vmax v. max speed on GPS over several runs to detect error. n=2 speedometer reads avg 4.15 mph fast