3.75 mm difference by your calculations.
8mm is 5/16ths of an inch,
so less than half of that ...
a smidge over 1/8th inch.

tires vary in actual phsyical size and height a whole lot more than that,
brand-to-brand, size to size. .
Two tires of the exact same size can differ by as much as a  fat inch in
height from manufacturer to manufacturer ..
so it 'sorta depends' ..
those two are likely pretty close . .
but one would have to see them mounted and inflated to really see how they
relate size-wise.

I suspect the 205/65 is slightly narrower / taller ..
70 series tires are slightly lowish, generally, not too much, but some.

suppossidly the aspect ratio if not stated ( as in 195 R 15 say ) is 78.

scott
----- Original Message -----
From: "BenT Syncro" <syncro@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, September 06, 2010 3:37 PM
Subject: Re: Im also looking for tires for my Vanagon westy

Sidewall height as I understand it:

205mm X 70% = 143.5mm
215mm X 65% = 139.75mm

Looks to me that 205/65/15 is taller. Multiply the difference times two (top
sidewall plus bottom sidewall) for the total difference in height.

BenT

On Sep 6, 2010, at 3:05 PM, Scott Daniel - Turbovans
<scottdaniel@TURBOVANS.COM> wrote:

> thanks for posting this Paul.
> this tire looks like a fine choice in 15 inch ..
> price isn't bad either.
>
> you say you had Agilles before ...
> where they the 205/65 R 15C ones ?
>
> if so, how does the diamter compare between these 'new' 205/70's and the
> 'old' 215/65's ?
>
> which is taller ?
> I bet they are close in diameter.
> thanks,
> scott
>
>
>