That size in a Bridgestone does 898 revs per mile which works out to be 1.79m
for each rev. and you can work the rest out. I've never heard of a .5:1 gear
ratio either, steepest i've ever seen is .7nnn:1
regards
Terry
> Dave,
> 60/4.111=14.595
> 14.595 * 1.97= 28.75 km/1000 in 1:1 gear circumference of tyre
1.97 m
> I guesstimate for a 225/35 X17)
> For a 0.5/1 fifth (which is a pretty low gear) speed would be
> 28.75/0.5 = 57.5km/1000 rpm
>
> Your problems were occurring in your calc for circumference of the wheel
> tyre assembly.
> Cheers
> Feral Errol
> mailto:[EMAIL PROTECTED]
> http://www.datrats.com.au/
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of David Costello
> Sent: Thursday, May 03, 2001 12:01 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Speedo guru
>
>
> sorry it's late and I'm probably doing something stupid but I can't get this
> to work
>
> I'm trying to work out the top speed of a car with 17" rims and 35 series
> tyres a 4.11 diff and 0.5:1 5th gear this is what I'm getting
>
> 17" = 431.8mm+35mm for the tyres=466.8mm
> 466.8 * 3.14 = 1465.75
> 1465.75 * 60 = 87945
> 87945 / 0.5 = 175890
>
> or in cm
> 43.18 + 3.5 = 46.68
> 46.68 * 3.14 = 146.57
> 146.57 * 60 = 8794.51
> 8794.51 / 0.5 = 17589.02
>
> I know I'm doing something wrong
> and it's probably something stupid I'll kick myself for not thinking of
>
> could someone please point out my ignorance
>
> Dave
>
> ----- Original Message -----
> From: "Errol Smith" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Friday, April 27, 2001 10:13 PM
> Subject: RE: Speedo guru
>
>
> > James,
> > If I can just but in, the easy way to work out speeds in gears is to take
> > the tyre circumference and multiply by 60. Then divide by the diff ratio.
> > This gives the speed in 1:1 gear. For the rest of the gears divide by the
> > gear ratio (ie 3.3, 2.0, 13 etc).
> >
> > Cheers
> > Feral Errol
> > mailto:[EMAIL PROTECTED]
> > http://www.datrats.com.au/
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of jamesf
> > Sent: Friday, April 27, 2001 8:58 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Speedo guru
> >
> >
> > Hi Terry
> >
> > How you going? thanks for sorting out those
> > unsubscriptions recently (well ages ago now :)
> >
> > I am just trying to work out the best tyre size
> > for the race car...
> > I had a bit of a search through old archives and
> > it seems you may have just what I am after...
> >
> > I need to work out the combinations of wheels,
> > final drive ratios, Max speed at RPM etc
> >
> > Can that spreadsheet you have help me out there??
> >
> > regards
> > James
> >
> >
> >
> > Terry & Heather wrote:
> >
> > > Pete,
> > > I can run that through my gearing spreadsheet but I'll have to dig up
> how
> > many
> > > rev/mile the yokies do.
> > >
> > > terry (i'll be back)
> > >
> > > Peter and Trace wrote:
> > >
> > > > Hi all,
> > > > My speedo is reading ~13% high ( checked against GPS) what
> > speedo drive do
> > > > I need? Datsun 1600, Z18ET 5 speed, 3.9 diff, 205/60 13" Yokie 352s.
> > > > Thanks,
> > > > Pete.
> > >
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> > Director
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