Oh, doh! I misread that message ;)

I had a police officer friend of mine check mine with his radar at
30, 40, 50, 60, and 70 on the speedo. It was almost exactly 10% fast
at every speed. IOW, at 55 I was registering 60. At 64 I was
registering 70. He said he couldn't check any faster than that
without writing me a ticket, but like you, I'd assume the 10% to hold
true throughout the range.


--- In zrx1100-1@yahoogroups.com, "rich_betz" <h20-k9@...> wrote:
>
> Yep, yer right. The main sprockets have no effect on the speedo,
> however what chris was asking is
> "what is the percentage of error of the speedo?"
>
> I have had my GPS gadget on the bike many times, and it is 5MPH
> optomistic at an INDICATED 60MPH. I don't have a spreadsheet of
> speeds, but I can say that the error increases as speed increases.
>
> At my INDICATED 150MPH, I would give a good guess that I might only
be
> doing somewhere around 140 or maybe even less, but we all know that
we
> use the bragging rights of the better of 2 numbers.
>
> About 4yrs ago, I retrofitted a digital speedo/tach into my original
> Vmax speedo housing. You have to calibrate the speedo by driving
along
> side another KNOWN GOOD SPEED SOURCE. Instructions recommend another
> car, I used my GPS. In this day and age, your most accurate
> measurement of speed is going to be GPS or RADAR. The speedo is
> calibrated at a measly 45MPH but I will trust the accuracy of a
> digital signal over the mechanical drag of gears and the typical
> unlubricated speedo cable.
>
> After years of blasting around on the Vmax with the factory speedo,
it
> seemed REALLY FAST as indicated by the factory speedo. After
hooking
> up the digitally calibrated, digital speedo, you would be amazed
> (disappointed) as to how much slower you are actually going.
>
> From that experience, when I hear other Vmax guys who are 225+lb fat
> asses like myself, when they say they run their Vmax at 145 to 155+
> all day long, I know they are sadly fooling themselves. Their
factory
> speedo's are just as inaccurate as mine was. The Vmax is no slouch,
> and there are definately one's faster than mine, but I can tell you
> that they are NOT EXACTLY as fast as the owners think they are.
>
> OK, I know, not exactly sprocket talk, but..........
>
> Later,
> R.Betz
>
>
>
> --- In zrx1100-1@yahoogroups.com, econes <no_reply@> wrote:
> >
> > Good news. Speedo operates off front wheel. You can mess with
your
> gearing all you want without affecting it.
> >
> > --- In zrx1100-1@yahoogroups.com, chris burgess <cvb302@> wrote:
> > >
> > > Sounds great. How bad is the speedo off?
> > > Date: Wednesday, November 5, 2008, 2:27 AM
> > >
>