Re: 4kscq wheel offset and wandering

[AUDIDUDI@delphi.com]

>      Think of it this way: take the extra inch and put half on each side
>      of the wheel centerline. The stock offset of 45mm now is
>      pushed out another .5 in or about 12.7mm giving a new theoretical
>      offset of 57.7mm.  So to compensate for the extra width the offset
>      must be REDUCED by 12.7mm leaving an ideal offset of 32.3mm.

This is WRONG!  The offset is determined by measuring the distance from the
wheel centerline to the mounting face ... if you add an equal amount of rim
width to both sides of the wheel, this dimension does NOT change.  You have
confused "offset" with "backspace"... 

>      Aftermarket wheels commonly come in 35mm offsets so that's what you
>      got!

Just because Ronal recommended a specific offset doesn't mean it's the best
choice for that particular car ... it more likely means that is the closest
offset they have available from the three or four castings they're using to
make wheels for a wide range of cars.

>      The small change in scrub radius of 2mm will not cause the car to
>      dart or wander but the wider tires you have on there will have a
>      tendency to follow the road much more than the stock size.

Agreed ... the 4k/4kq/etc. was designed with a 14mm "negative roll radius" 
and you WILL notice a bit of "wander" if you reduce the offset by any more
than this amount.  Of course, since you'll probably be changing to a lower
profile tire, which tend to do this as well, it's hard to isolate one from
the other in practice.

     _             _             
    / l       l o l  \       l o   Jeffrey Goggin
   /__l l l / l l l  l l l / l l   * * * * * * *
  /   l l_l \_l l l__/ l_l \_l l   AudiDudi@delphi.com