i made a major typo!
the number of inches in a mile should be:
63,360 NOT 36,360
i erased the message quickly after sending it, and you caught it
before i could make the change. but here it is again...

this should work for you...
i think...

g = gear-inch ratio
rpm = rpm value
60 = minutes in an hour
63,360 = inches in a mile
MPH = Miles Per Hour

(g * rpm) * 60 / 63,360 = MPH

in my case...
(80 * 90rpm) * 60 / 63,360 = 6.8 mph

hope this works for you,
-= tony from va =-


--- In OldSkoolTrack@yahoogroups.com, Paul Martinez
<paul_c_martinez@y...> wrote:
> that's outstanding.
>
> so in our example, with a 75 inch wheel, 160 rpm gets
> you to 19.8 mph and 90 rpm equals 11.14mph...
>
> cool.
>
> --- iconx804wos <iconx804wos@y...> wrote:
> > this should do it for you...
> >
> > g = gear inch
> > rpm = rpm
> > 36,360 = inchs in a mile
> > 60 = minutes in an hour
> > MPH = miles per hour
> >
> > (g * rpm) * 60 / 36,360 = MPH
> >
> > love this board,
> > hope this helps,
> >
> > -= tony from va =-
> >
> > --- In OldSkoolTrack@yahoogroups.com, Paul Martinez
> > <paul_c_martinez@y...> wrote:
> > > hey
> > >
> > > I've got a question, does anyone know the
> > calculation
> > > to convert from cadence/wheel length into miles
> > per
> > > hour? or for that matter miles per hour and wheel
> > > length into cadence?
> > >
> > > I've been riding fixed gear in chicago for a while
> > and
> > > I always have kind of a hard time figuring the
> > whole
> > > cadence thing. So like, with a 72-75 gear-inch
> > ratio,
> > > what do 160 rpms and 90 rpms translate into in
> > terms
> > > of mph?
> > >
> > >
> > >
> >
> >