[V8] wheel offset calculator program

[S_Matus]

Jeremy -  

also check the link for a great detailed diagram of wheel offset and clearance.

http://www.fikse.com/fitment.html

_________ Original message _________

Message: 9
Date: Thu, 3 Feb 2005 21:18:13 -0800
From: "Jeremy Ward" <jward at mti-interactive.com>
Subject: [V8] wheel offset calculator program
To: <v8 at audifans.com>
Cc: s-car-list at audifans.com
Message-ID:
	<A30711979A4DEF4ABCB18A2F3462270B38C891 at mtisrv02.moandted.org>
Content-Type: text/plain;	charset="us-ascii"

Hey gang.  I was asked some really difficult math by someone who read 
my
post and actually thought I understood the fine art of offset.  8-|
Yikes, does he know I failed calculus 2 times?!? (they always say that
the 3rd time is the charm)

In checking my answer (to see if I actually new what I was talking
about) I found the following calculator:
http://toy4two.home.mindspring.com/offset.html 

It's pretty straight forward when the width stays the same, but if it
changes you must split the width difference in two, convert to metric,
apply to offset...  A lot easier to just use the offset calculator.  
:-)

Another good resource is this explanation of what offset is:
http://www.tirerack.com/wheels/tech/offset.jsp 

Oooh, and a nice tire calculator:
http://toy4two.home.mindspring.com/tire.html 


So, for those who liked story problems in math class...  If my V8 has 
an
ET35 offset on a 17x7.5 rim, and I upsize to a 18x8 ET45 rim, how big 
of
a spacer do I need to keep the inside edge of the rim in the same spot
so it still clears the tie rod? 

Answer:
8" - 7.5" = .5" 
divide .5" by 2 = .25" 
now convert .25" to metric = 6.35mm
Now add 6.35mm to the difference between 45mm and 35mm = 16.35mm

Same answer as the calculator above gave (16mm).  Make sense?  

Of course the method I used on my V8 was to mount the wrong-offset
wheel, say 'wow that looks stupid', grab a tape measure, figure out 
what
would just barely tuck them under the arched fender w/o rubbing, and
order the spacers!  :-)

Cheers,

- Jeremy




		
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