[DeTomaso] 17-inch wheel back spacing

[doug351c]

Let me explain further.

The 5.25" back spacing for the stock 8x15 should directly apply to the 8x17
for the front.  Wheel diameter doesn't affect where the edges of the tire
are for a given tire width and outer tire diameter.  For a stock bodied
Pantera that has had its spacers removed, you can't go any crazier than a
245mm wide tire on the front and sometimes you have to drop back to 235 or
225 depending on the particular car.

At the rear, if you put 1/2 the additional 1" wider wheel width on each side
of the wheel, all you'll get is a wider tire section width near the rim with
the same section width at the crown of the tread.  For an 11" wheel vs the
10" Campy, a 5.75" back spacing achieves this because it is the stock 10"
wide Campy's 5.25" backspace + 1/2 the additional wheel width.  The tire
center remains at the same point on the car with either the stock 8x15 Campy
or the 8x17.  What could be a safer choice that this?

Doug Braun

-----Original Message-----
From: Mike Drew [mailto:MikeLDrew at aol.com]
Sent: Monday, August 11, 2014 5:42 PM
To: <doug351c at gmail.com>
Cc: POCA Forum Mailing List
Subject: Re: [DeTomaso] 17-inch wheel back spacing


Thanks Doug. But as I said, back spacing for different size wheels isn't
really useful. I appreciate your effort nonetheless!

Mike

Sent from my iPhone

On Aug 11, 2014, at 17:38, "doug351c" <doug351c at gmail.com> wrote:

> Mike,
>
> My records show the following stock Back Spacings (rim mounting face to
> inner rim edge):
>
> Stock Campy, 7x15 4.25"
>             8x15 5.25"
>        10x15 5.25"
>
> I used 5.25" back spacing for both my front and rear 8x16" and 10x16"
> Compomotive wheels.
>
> But for an 11" wide rim I can't tell you where to put the extra inch but
> splitting the difference at 5.75" might be pretty close.
>
> Doug Braun
>
> -----Original Message-----
> From: DeTomaso [mailto:detomaso-bounces at poca.com]On Behalf Of Mike Drew
> via DeTomaso
> Sent: Monday, August 11, 2014 5:10 PM
> To: detomaso at poca.com
> Subject: [DeTomaso] 17-inch wheel back spacing
>
>
> Guys,
>
> Somebody has asked me what optimal back spacing would be for 17x8 and
17x11
> wheels?
>
> Since back spacing varies with wheel width, the spacing of wheels with
other
> than these dimensions is irrelevant. If you know 17x8 and 17x11 numbers
> please let me know.
>
> Thanks!
>
> Mike
>
> Sent from my iPhone
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> DeTomaso mailing list
> DeTomaso at poca.com
> http://poca.com/mailman/listinfo/detomaso_poca.com
>