Date:         Sat, 29 Oct 2011 12:32:01 -0700
Reply-To:     BenT Syncro <syncro@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         BenT Syncro <syncro@GMAIL.COM>
Subject:      Re: An interesting article on gas mileage vs wheel size
Comments: To: Ken Lewis <kdlewis@NORTHSTATE.NET>
In-Reply-To:  <008801cc9659$e6f28150$0301a8c0@korky2>
Content-Type: text/plain; charset=us-ascii

Putting on a 2wd? Do you have the offset rather than a measured or calculated backspace? It's the figure that says 'ET' followed by a couple of numbers. I'd like to help but don't want to rely on the expression of offset as backspace because accuracy can be affected by how you arrived at that number IMHO.



BenT

sent from my electronic leash

On Oct 29, 2011, at 9:43 AM, Ken Lewis <kdlewis@NORTHSTATE.NET> wrote:

> I found this article while researching what it would take to get 17"x7.5"
> Audi A4  wheels to work on my crewcab.
> 
> This line caught my eye;" What's immediately apparent from the results is
> that as the wheel-and-tire packages get larger and heavier, acceleration and
> fuel economy suffer. Neither is a huge surprise, but we measured a
> 10-percent drop in fuel economy and a four-percent degradation in
> 0-to-60-mph acceleration from the 15s to the 19s".
> 
> I  looked at  these this morning.
> http://winstonsalem.craigslist.org/pts/2618213904.html . Nice looking BIG
> wheels. Some road rash. He also has the longer lug bolts.
> 
> The bolt hole size is good but it appears the center bore (~57mm) would need
> to be opened up. I need to actualy take a front wheel off my truck and do
> some measuring . I have read the grease cap can be shortened to get rid  of
> the lip.
> 
> I arrived at a  back spacing of 137.25mm on the Audi wheels . By my
> calculations I would need a 14mm spacer? Anyone?
> 
> Thanks Ken