I've got a K8 Wee with stock size tires. Running on the interstate yesterday, it sure seemed like my bike's speedometer was very optimistic. I have nothing solid to base this on other than the cars on the road passing me continually. The area that I rode in has a speed limit of 75 and with my speedo showing 80 I was with big trucks in the slow lane.
Is there any chart of information that someone has compiled referencing indicated vs. actual speed?
If you own a car GPS and it has the MPH mode stick it on your bike and compare the two readings. My 08 DL650 odometer reads about 6kph faster than actual at 80 kph in relation to the GPS. Seems the bike manufactures err on the side of caution when it comes to bike speedometers.
Lots of free speedo apps for your phone. Download one, stick it on your bars for a couple rides. Then you'll know. All my bikes think they're faster than they are. Just like me.
Australias design rules state a speedo can read 10% plus 4 km/h more than the actual speed but cannot read below the actual speed.
So it stands to reason that the manufacturers build in a bit of leeway.
8% seems to be the number. I just figure 5%, which is easy math to do without pencil and paper. That way I know I'm very close to actual and still on the safe side of the law. Either that or I just go fast as hell because it's fun.
on my 05 wee the speedometer is driven by the front wheel. so changing sprockets won't affect the speedometer reading. the tach reading will be different at the same speed with different sprockets.
Mine seems to be around 4.7% high using my gps as a reference, and is consistently so from 10mph/16kmh up to an indicated 85mph/137kmh (80-81mph on gps) Haven't checked at higher speeds as I get kinda busy up there ?. When I don't have the gps mounted, I use the tach: 4500rpm in 6th= 59-60 mph/95-96kmh w/stock gearing.
At around 40 mph the speedo on my K7 Vee reads about 5 mph fast compared to the GPS, and more like 10 mph above 70. There's a percentage in there somewhere.
Yes, my 2014 DL1000 VStrom reads about 5 mph high at 60 - 80 mph reading by GPS. So does my BMW K100RS. And my car and every car I've had a GPS in. If they're trying to compensate for the earths rotation they haven't gotten it right.
Actually it is an arrangement between government and manufacturers to set speedos slightly higher so to keep vehicles from going too far over the limit.
As such, a driver with no knowledge of this (most) will drive 75mph in a 70mph but they are actually travelling at 72mph.
I am not sure how it works with vehicles that have gps built-in. Does the gps and speedo disagree? I dont know.
Did you install it after changing your sprocket or was the bike stock?
The website says "The SpeedoDRD cannot alter your existing odometer readout. The SpeedoDRD corrects and fixes the speed signal after it was altered by something else, such as sprocket changes or tires size changes or transmission changes." I'm curious if it has any effect on a stock bike?
Same on my new 2018 1000XT. Bought a Speedo Healer to correct it. For some reason I don't understand, reading 5-8% higher than actual is built into it???
On Android I use DigiHUD. I used it a bit in the past to verify that the speedo on my old bike was true (I was surprised that it was) and a quick check shows that it is still add free (but there is an optional paid version).
Often cars can be purchased with different size wheels EG; 16" or 17", same car different sizes so their calibrated to accommodate both wheels.
It can also come down to the individual car, I once had 2 identical Holden's, the only difference was the colour, one was spot on the other was off by 3%
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