A 205/65-15 is really the same diameter as the 185R14s. You have to be real careful in this size for adequate capacity. Even an extra load (XL) tire in this size only has a load index of 95, (1521 lbs.) before de-rating. You should have the LT load range "C" in this or "D" in this size. A 215/70-14 would be slightly better as the standard tire has a 96 (1554 lbs.) in that size. 

Dennis
   

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Loren Busch
Sent: Thursday, March 15, 2012 1:50 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Tire size

On Thu, Mar 15, 2012 at 10:07 AM, Jim McGuckin <teammcguck@gmail.com> wrote:

> Best tire size for road and to keep speedo right in a 15". Is that a
> 215/60r15 load range C?
>

I'm mounted 205/65R15's in January and the speedo stayed right where it had been with the 185R14s  I took off, 2% off, reads just under 2 MPH low at a true 60 MPH.