RE: tires [backspacing]

From: Jason Jennings (jason@spray-tech.com)
Date: Thu Feb 04 1999 - 11:51:30 EST


thanks.....so if I want to look for a new 15 rim....I should be looking
for a back spacing of 5.5" to be in the go???? I naturally have the 17s
on so....

Jason
2/4/99 11:56 AM

        -----Original Message-----
        From: Bob Tom [SMTP:tigers@bserv.com]
        Sent: Thursday, February 04, 1999 6:10 AM
        To: dakota-truck@buffnet.net
        Subject: RE: DML: tires [backspacing]

        Jason

        Backspacing is the distance from the lip of the backside
        of the rim to the mounting surface of the rim.

        The stock 15x7 rim has a backspacing of about 5.5"

        In order to measure the backspacing with a tire mounted
        on the rim, you will need to get a 15" or so ruler (or
equivalent)
        so that it lies on the lip of the rim across to the other
        lip. This is needed because the tire bulges beyond the
        rim lip.

        Any backspacing less than 5.5" has the effect of
        moving the rim/tire outward ... i.e. too much and the
        tire will be beyond the fender lip and stress the suspension
        parts.

        Any backspacing more than 5.5" has the effect
        of moving the rim/tire inward ... with the '97+, depending
        of the cross section of the tire, the bulge will rub on
        the a-arm on the front /// with the rear, you need only
        be concerned with the leaf spring ... a lot more room to play
with.

        Bob
        Burlington, Ontario

        '97 CC Sport, 5.2L, 3.55 auto., flame red
          Gibson duals, KN drop-in
          Coloured-keyed grille guard, running boards
              and hard tonneau cover
          Deflectors, grille insert
          AR-211 15x7 rims (4.75" backspace)



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