Folks,
The original Marcos alloys are 5.5" x 13" with a 3"
backspace and a .25" + offset. Measured mine last night.
Here is a link that explains backspace and offset.
Same place you got your wheels Dave.
As far as I can tell, the Mantula has the same front
suspension as the pre 1972 cars but has a wider Capri rear axle. They
widened the rear by 4 inches. In the book "Marcos, Coupes and Spyders" it
has a few reviews from different mags regarding the Mantula. In one
article it says the car has 205/60 vr14 tires. Next article says it has
195/60HR14 in front and 205/60HR14 in the rear. Then in 1987 another road
test says it has 6 inch rims with 225/60VR14 tires. In 1991 when they
introduced the Mantula Spyder they went to a independant rear end and used 6"
x15" wheels in front with 195/55VR15 tires and 7" x 15" wheels in the rear with
205/55VR15 tires.
Confused yet??
So................14" doesn't look to be any problem at
all. Stephen Spaldings Marcos has 14" wires.
15" on the other hand will take some thinking.
To NOT extend the tires further outwards, the backspace has to increase
with any wheel width increase. Going to a 6" wheel, you would need a
backspace of 3.25" to maintain the +.25" offset. Going to a 7" wheel,
you would need a backspace of 3.75" to mantain the +.25" offset. Doesn't
sound too bad now!? A 7" wheel would extend the wheel .75" further inward
than currently.
Here is a link for tire dimensions: sizes, allowable rim
widths, tread width, section width, load range, circumference, etc.
Now I'M confused.................. I better do a
spreadsheet on this whole deal. More later.
Don Lattimer
#3m5759
Willits, CA, USA
----- Original Message -----
From: Dave BartonSent: Thursday, April 24, 2003 3:28 PMSubject: [MarcosManiacs] Re: 15" wheelsDon
They are COMPOMOTIVE rims they are available in the US at a company
called MOTORSPORTS SPECIALTIES in Pennsylvania.......the rims on the
Marcos are 7" in front and rear.......I did give some bad info last
post......the front rims have a 4" backspace not 3" the rears have a
3" backspace
-- In MarcosManiacs@yahoogroups.com, "Don Lattimer"
wrote:
> Dave,
>
> What make of rims are you using? What is the width 6", 7",????
>
> Don
> #3m5759
> ----- Original Message -----
> From: Dave Barton
> To: MarcosManiacs@yahoogroups.com
> Sent: Thursday, April 24, 2003 1:53 PM
> Subject: [MarcosManiacs] Re: 15" wheels
>
>
>
> Hi Paul, Don and all
> Paul I came down with the flu on Saturday........from all reports
I
> missed a really good show.......my 0.02c on the wheel
question......
> I am using 205/60/13 on my car that is what it had on it when I
> bought it ,I just bought new tyres as the others were race tyres
> The rim has a 3" backspace ,that is its measured from the
mounting
> face of the rim to the outer bead of the rim .I have no
suspension
> interference even with the wider tyre .......with a taller rim
you
> may be able to go further inboard(more backspace) because you
might
> be above the upper balljoint with the inside of the rim. Check
> carefully with full suspension travel.........remove the shock
and
> cycle the suspension up and down to check clearances .
> As for rims I looked high and low for a particular style wuth
the
> correct backspace and bolt circle for another car and eventually
went
> to a modular rim........the backspacing and widths can be custom
> tailored to youR needs ........a bit more money but worth it I
think
> Cheers Dave#5577
>
>
>
>
>
>
>
>
> --- In MarcosManiacs@yahoogroups.com, pauldransfield@i... wrote:
> > Hi Don,
> >
> > I'd like some input too. I've decided to go to a larger wheel
> myself and
> > know that a 14" is doable but would like to go up to 15" as
well if
> > possible. The only problem I can envision is the wider wheel
> fouling during
> > full steering lock. I've been putting it off for months because
I
> can't
> > decide what wheel design I want. Did you come up with anything
> interesting
> > with four bolt holes?
> >
> > Dave Barton, did you make it to Ancaster last Sunday? It was so
> busy, it was
> > hard finding anybody but I didn't see any TVRs there.
> >
> > Mike Denham, thanks for the T-shirt. It arrived yesterday.
> >
> > Regards,
> >
> > Paul Dransfield
> > 3 litre Volvo
> >
> > -----Original Message-----
> > From: Don Lattimer [mailto:donlattimer@p...]
> > Sent: April 24, 2003 12:21 PM
> > To: MarcosManiacs@yahoogroups.com
> > Subject: [MarcosManiacs] 15" wheels
> >
> >
> > Hi all,
> >
> > Has anyone put 15" wheels/tires on their pre-1972 Marcos?? I
> currently have
> > the original 13" wheels with 195/70HR13 tires. I wondering if
15"
> wheels
> > with 225/50HR15 tires would have enough clearance. 225/50HR15
> tires have
> > the same circumference as my current tires so ride-height would
> remain the
> > same. Pretty sure 15s' would fit in the rear wheel wells but
I'm
> concerned
> > about the front steering clearance.
> >
> > Any help??
> >
> > Don Lattimer
> > #3m5759
> >
> >
> >
> >
> >
> > To unsubscribe from this group, send an email to:
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> >
> >
> >
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