From: Wally Plumley [wplumley@bellsouth.net]
Sent: Tuesday, October 09, 2001 1:46 PM
To: 928
Subject: [928] Re: Subject: Re: Wheel Widths

Wheel Measurements

Diameter - Measured radially at the flattest portion of the bead seat.
Wheel Width - Measured transversely at the most vertical part of the bead seat.
Overall Rim Width - Measured transversely at the outside of the rim.
Rear Spacing or Backspacing - Measured transversely from the inside rim 
face to the mounting surface.
Offset - Distance from the center of the rim plane to the mounting surface 
plane. To calculate offset, use
Offset = Backspacing - Overall Rim Width/2

Wally