Re: [ST] effect on tach?

["ASHLEY BENNETT" <spondon955@xxxxxxxxxxxxxx>]

I think you are talking at cross purposes. Obviously changing the gearing
affects the RPM at a given speed, that's the whole point of doing it. The
tachometer measures engine revs and these remain constant regardless of the
gearing, they just correspond to different speeds.
Ashley

> Bare,
>
> I disagree, about changing sprocket ratio's not affecting (RPM) or (MPH).
> It will, although I don't know the technical reason to back me.  On my RS
> with stock ratio of 19/43 I run 5000 RPM doing 86 MPH.  Now, like I said,
I
> don't know the theory behind it BUT I guarantee that if I change my ratio
to
> 17/43 my RPM's will be higher at the same speed of 86 MPH.
>
> Hence, with a 17/43 ratio, my MPH will be less doing 5000 RPM's or ii I
> choose to go the same speed as before then my RPM's will be higher to do
the
> same 86 MPH as before.
>
> I was going to wait till I was ready but since this topic was brought up I
> have a question for everyone.  With stock ratio of 19/43 I run 5000 RPM
> doing 86 MPH.  I want to change my front sprocket at my 12000 mi service
but
> unsure if I want 18/43 or 17/43.
>
> Question:  Anyone out there who is running 18/43 or 17/43, what is your
RPM
> in 6th gear doing 86 MPH???
>
> I know the RPM will go higher with each step but how much will make my
> decision on which setup I want.  Any input would be appreciated.
>
> -Rich
>
> ----- Original Message -----
> From: bare <barenekd@xxxxxxxxxxxxx>
> To: <ST@xxxxxxxxxxxxxx>
> Sent: Monday, May 13, 2002 1:57 PM
> Subject: [ST] effect on tach?
>
>
> > Changing gearing has no effect whatsoever on your tach. The tach
measures
> > engine RPM and doesn't give a rat about gearing. Changing gearing also
> will
> > not effect the speedo since it is driven off the front wheel. What will
> > change is the relationship between the tach (RPM) and speedo (MPH). But
> they
> > both will continue with the same errors that were originally there.
> Changing
> > front tire size will affect the speedo on a Triumph.
> > On the other hand, all motorcycles do not drive off the front wheel,
some
> > drive off the rear wheel and some drive off the tranny. Changing gearing
> or
> > rear tire size on these will effect any speedo error. They do not affect
> the
> > tach, either, however
> > People who run oversize tires on their pick-m-up trucks would like to
have
> > more accurate speedos, so the Yellow box is handy for them. All off road
> > vehicles are not driven 100% off road.
> > Bare.
> >
>
>
>
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