You are talking radius and I'm talking circumference . My mistake . I
always think in circumference when I'm doing gear ratios .
Thanks
Eric H.
TC wrote:
>
> Eric,
> The rolling radius is the distance from the center of the axle to the
> ground with the bike sitting on the ground. 12.47 is the advertised
> rolling radius of a Dunlop Qualifier K525 ... If you want to talk
> distance per wheel revolution I'll take that too .. for the 12.47
> rolling radius stock tire that would be 6.53 feet. I can't guess at
> the rolling radius of the 18 inch tire .. but I could compute it if I
> knew the gearing. I have to have one or the other.
> campbell
>
> ----- Original Message -----
> From: "Eric Harnish" <[EMAIL PROTECTED]>
> Subject: Re: Rpm at 70
>
> > TC what is a rolling radius of 12.47 inches ?
> > My tire is a little over
> > 6 feet .
> >
> > TC wrote:
> > >
> > > Phil,
> > > I get approximately 4450 RPM in 5th at 70 mph for a "stock" Vmax
> ...
> > > this would be a "stock" Vmax with a 12.47 inch rolling radius
> tire. If
> > > your 18 inch tire had a 12.47 inch rolling radius it would be the
> > > same. I need either your rollling radius or the number of teeth on
> > > your front and rear sprocket, (assuming your primary drive and
> > > transmission gears are stock), to compute the rolling radius
> before I
> > > could tell you what your 18 inch tire would do on a stock
> driveshaft
> > > bike.
>
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