This months Grassroots has an article about rim v. tire width. They say the
rim should ideally be 85% of the tires width for maximum performance.
Mike
----- Original Message -----
From: "Gordon Glasgow" <gsglasgow@home.com>
To: <datsun-roadsters@autox.team.net>
Sent: Saturday, October 20, 2001 11:32 PM
Subject: RE: FW: Original Tire height
> I'm currently running 195/60-14 tires on 6" wide rims. I have run 185/70
and
> 185/60 tires on the same rims. It's probably obvious that I prefer a wider
wheel
> for a given tire size than a lot of other people, but that's based on my
driving
> style (rather vigorous) and my autocrossing experience.
>
> Usually an aluminum rim will measure about 3/4"-1" wider on the outside
than the
> actual rim width, depending on the design of the wheel and where you take
the
> measurement, but the only way to tell for sure is to dismount a tire and
measure
> it. This diagram should explain why that is the case:
> http://www.gordon-glasgow.org/Images/wheel_csect.jpg
>
> Start with this page at the TireRack Web site:
> http://www.tirerack.com/tires/tiretech/sidewall.htm
> It has a lot of good general information about tires, sizes, etc. Then
look at
> the tire size conversion chart for some interesting comparisons.
>
> Gordon Glasgow
> Renton, WA
>
>
> > -----Original Message-----
> > From: owner-datsun-roadsters@autox.team.net
> > [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Chris Doutre
> > Sent: Saturday, October 20, 2001 12:46 PM
> > To: Gordon Glasgow; datsun-roadsters@autox.team.net
> > Subject: Re: FW: Original Tire height
> >
> >
> > Gordon,
> >
> > This tire discussion has been extremely helpful. One of the things I
haven't
> > seen discussed is what wheel size you are using. Is that a valid
question? I
> > have some 165/SR14's that I need to replace on 6" (outside-width)
aluminum
> > wheels. Is that what everybody else is running? Is it really OK to run a
> > 185/65/14 on a 6" wheel, probably 5.75" inside-width at the bead edge?
It
> > seems wide to me, but I'm really in the dark about this stuff.
> >
> > Thanks.
> > Chris Doutre
> > Scottsdale, AZ
> > 1967 1600
> >
> > ----- Original Message -----
> > From: "Gordon Glasgow" <gsglasgow@home.com>
> > To: <datsun-roadsters@autox.team.net>
> > Sent: Thursday, September 20, 2001 1:53 PM
> > Subject: RE: FW: Original Tire height
> >
> >
> > > A tire's effective radius is different than the calculation from it's
> > diameter.
> > > R&T's test reported revs per mile and I calculated back from that.
> > >
> > > Gordon Glasgow
> > > Renton, WA
> > >
> > >
> > > > -----Original Message-----
> > > > From: John F Sandhoff [mailto:sandhoff@csus.edu]
> > > > Sent: Thursday, September 20, 2001 11:08 AM
> > > > To: Gordon Glasgow
> > > > Cc: datsun-roadsters@autox.team.net
> > > > Subject: RE: FW: Original Tire height
> > > >
> > > >
> > > > Gordon writes:
> > > > > My calculations were based on an aspect ratio of 82%, which might
> > > > > not be correct.
> > > >
> > > > I HAVE a 5.60x14 on the rim. I know its circumference is at least 3
> > > > inches larger than the calculated 73.1 (5280 ft/mile * 12 in/ft /
866
> > rev/mi).
> > > >
> > > > Maybe R&T was running their tests using flat tires :-)
> > > >
> > > > -- John
> > > > John F Sandhoff sandhoff@csus.edu Sacramento, CA
> > >
> > > ///
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