Hi Adam,
Yes, you got it right, and said it better. Oh, welcome back to the list!
I'm running 195/60/14 tires on Libras. 15's would look cool!
Fred  So.SF
BADROC
 Original Message 
From: "Adam Bradley" <ambradley@yahoo.com>
To: "Patrick P. Castronovo" <slick1@mohaveaz.com>; <Fred_Katz@ci.sf.ca.us>;
<datsunroadsters@autox.team.net>; "Michael Poorboy"
<bitterrootprop@nidlink.com>
Sent: Thursday, February 08, 2001 5:07 PM
Subject: Re: Roadster gear ratio's
> I think what Fred is saying (I haven't done the calculations to know
> for sure) is that 2.957 in 1st with 3.70 rearend rotates the tire at
> the same rate as 3.117 in 1st with 3.90 rearend. In reality 2.957 is
> 2.957  that defines the ratio of driveshaft rotation to engine
> rotation; the driveshaft turns once every 2.957 turns of the engine,
> right? But then it goes through the rearend and turns the wheels, and
> the wheels cover so much distance depending on their cicumference, so
> speed of the car at a given RPM, gear ratio, and rearend ratio changes
> once again.
>
> Ugh! I think I'll leave my transmission and rearend alone and get some
> 15x6 Panasports and 195/50/15 tires because they "look cool". By the
> way, anyone have the exact offset (if any) needed for 15x6 Panasports
> on a 1970 Roadster with stock rear springs and comp front springs?
>
> Thanks,
>
> Adam
> 1970 SPL31128181
> 1967 SPL31108240
>
>  "Patrick P. Castronovo" <slick1@mohaveaz.com> wrote:
> > You have the gearing wrong. 5 speed:
> >
> > Fred
> > Chilton
> > book
> >
> > 1st 3.117 2.957
> >
> > 2nd 1.958 1.858
> >
> > 3rd 1.382 1.311
> >
> > 4th 1.054
> > 1.000
> >
> > 5th .898
> > .852
> > Pat
> >
> > Original Message
> > From: Fred_Katz@ci.sf.ca.us <Fred_Katz@ci.sf.ca.us>
> > To: datsunroadsters@autox.team.net
> > <datsunroadsters@autox.team.net>;
> > Michael Poorboy <bitterrootprop@nidlink.com>
> > Date: Thursday, February 08, 2001 2:18 PM
> > Subject: Re: Roadster gear ratio's
> >
> >
> > >Mike,
> > >
> > >So if you have a 1600 rear end 3.9, with a 5speed trans then you
> > get the
> > >following?
> > >
> > >5spd with
> > >1600 Rear end standard : 3.9
> > >
> > >1st Gear : 3.117
> > >2nd Gear : 1.958
> > >3rd Gear: 1.382
> > >4th Gear: 1.054
> > >5th Gear: .898
> > >
> > >And with smaller than stock wheels, that moves the 5spd values for
> > 1st,
> > >2nd, 5th even closer to the stock 4spd values for 1st, 2nd, and
> > 4th. Very
> > >interesting!
> > >
> > >Fred  So.SF
> > >BADROC
> > >'66 with 2000/5spd.
> > >
> > >___________________ Reply Separator _________________________
> > >>Subject: Roadster gear ratio's
> > >>Author: Michael Poorboy <bitterrootprop@nidlink.com>
> > >>Date: 2/8/2001 12:43 PM
> > >>
> > >>List,
> > >>I found my manual so here are the numbers for the Roadster:
> > >>
> > >>1600:
> > >>
> > >>Rear end standard : 3.9
> > >>
> > >>1st Gear : 3.382
> > >>2nd Gear: 2.013
> > >>3rd Gear : 1.312
> > >>4th Gear : 1.00
> > >>
> > >>
> > >>2000
> > > >Rear end gear standard : 3.70
> > >>
> > >>1st Gear : 2.957
> > >>2nd Gear : 1.858
> > >>3rd Gear: 1.311
> > >>4th Gear: 1.00
> > >>5th Gear: .852
> > >>
> > >>And the calculator link again is :
> > >>
> > >>http://www.geocities.com/z_design_studio/
> > >>
> > >>Thanks,
> > >>Mike
> > >>Nowroc
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