[Shotimes] winter wheels rim questions

[Ron Porter]

You may have made it a bit confusing, but backspacing and offset are two
different measurements that look for basically the same thing, although each
measurement alone can have it's value.

I'll give it a try!! 

Basically the definition below: Backspacing is the distance from the rear of
the rim mounting surface (portion that rests against the hub). This was the
usual measurement for US wheels, and is generally in inches.

Offset is the distance from the rear of the same rim mounting surface to the
center of the rim (between the beads) Imagine a plane that goes through the
rim right through the middle. Positive offset is when the mounting surface
moves toward the outside of the car, negative offset is when this surface
moves toward to inside of the car. Obviously zero offset is when the rim
mounting surface sits right at the center of the wheel.

The easiest way to picture it is with two wheels with a zero offset. One is
16x6", the other is 16x8". Same offset, much different backspace.

The one problem with offset is that it isn't good enough by itself. A 16x6"
wheel with a 42mm offset may work fine, but make that a 16x8" wheel, and
42mm may not work, something like 35mm may be needed. This is where the
backspace measurement comes in. the 16x6" wheel may have backspace "x", but
the 16x8" wheel will have a backspace of "x" plus "y", which could then hit
the strut.

Ron Porter (probably confused it more!)

-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of cmichaelo@optonline.net
Sent: Saturday, November 20, 2004 10:41 AM
To: Bruce Malachuk
Cc: shotimes@autox.team.net; TechSHO@topica.com
Subject: Re: [Shotimes] winter wheels rim questions


Stock offset is +42mm.  But any offset between 35-45mm should work without
risk of rubbing if you stick with the same size tire and rim.

Yes, backspacing is the offset to the rim (i.e., the distance from the rim
mounting surface to the outside of the inner rim.) In other "words"

BS = RW/2 + OS + LT

where BS is the Back Spacing, RW is the Rim Width, OS is the OffSet and LT
is the Lip Thickness. 

Typically LT=1/4" IIRC.

Michael
94MTX,green,BOS+,Koni/Intrax,Baer,Corbeau
SHO items for sale: http://hometown.aol.com/cmichaelo/for_sale.html

----- Original Message -----
From: Bruce Malachuk <bmalach1@nycap.rr.com>
Date: Saturday, November 20, 2004 10:02 am
Subject: [Shotimes] winter wheels rim questions

> Found a deal on some 16in snows mounted on a 5 lug * 4.25in set of 
> rims.Price is reasonable, but I'm wondering if they'll fit. Is 
> backspacing the
> same as the offset to the rim? What is the preferred backspacing 
> for a SHO
> suitible rim, and Isn't the offset range like 35-45mm for use on a 
> Taurus? 
> 
> Bruce J Malachuk
> 
> *	94 Opal Frost MTX 
> 
> *	93 Emerald Green MTX 
> 
> *	93 Black ATX - parts 
> 
> *	95 Silver Frost ATX SE - SLO 
> _______________________________________________
> Shotimes mailing list
> Shotimes@autox.team.net
> http://www.team.net/mailman/listinfo/shotimes
_______________________________________________
Shotimes mailing list
Shotimes@autox.team.net
http://www.team.net/mailman/listinfo/shotimes