Re: [ST] effect on tach?

["rmasiak" <rmasiak@xxxxxxxxxxx>]

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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