Paul Wrote,
>Jarrid,
>This might sound silly, but could you confirm what you mean by
>offset,=20
>please.
>I understand it to mean the distance from the back face of the wheel
>hub to=20=
>
>the outermost edge of the wheel rim that faces to the inside of the
>car.=20
>Does that make sense?
>
>Looking at a cross-section of the wheel:
>
>WORLD | | CAR-SIDE OF WHEEL
> | |<----------
> \ / |
> \ / |Wheel
> \ / |Offset
> \ / |
> | |<----------------
> | |
> | | HUB
> | |
>
>I have a set of 14x6 minilite replicas, that stick out of the guards
>at the=20=
>
>front. I would like to replace them with the same size & type of
>wheel, but=20=
>
>with the correct offset.
>Thanks,
>Paul.
Your drawing is correct as to the definition of "offset" as I understand
it.
The problem now is that the offset, actually has little to do with
whether or
not a given wheel will fit in the alotted space.
The important dimension is actually the total rim width minus the offset.
This dimension must be kept more or less constant, whether you are
running 4 inch wire wheels, or 7 inch minilites with slicks.
I measured my setup to verify my sanity, and it adds up like this...
the rim is 6.00 inches wide from tire mount to tire mount 6.5 inches on
the
outsides of the rim.
The tire itself 205 60 HR13 Yokohama A008RSII is 7.25 inches wide across
the tread and is 22.6 inches in diameter "rolling". The car is slightly
lowered,
but has higher rate front springs, so bottoming out is not too likely.
With the above setup, you could park another LBC between the tire
and the fenders.
This gives aprox 1.75 inches "outside offset", which is the dimension
which will
need to be held more or less constant regardless of what wheel you chose.
The wide the wheel, the more offset you will need.
The reason that this is the importnat dimension, is because this is the
dimension
that dictates if there will be constact from the outside of the tire and
the insides
of the fenders.
with a 5 inch wheel, a 3.00 to 3.25 inch offset would be OK.
so on and so forth.
<---------6.5------> Relative dimension
<-------6.0-----> Relative dimension
0 0
00000000000000
00
00
000<-4.25-> Relative dimension
000
000
<1.75> Critical dimension
As an afterthought, the 4.25 dimension is just a little too much, and the
fenders
are quite clear from rubbing. I will now consider putting on some 3/8
inch
spacers, at least on the rear to prevent the sidewall flex from rubbing
on the
insides of the chassis.
Or better yet, that and a panhard rod or Watts linkage.....
I know, I am rambling again.
Hope this helps.
Jarrid Gross
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 09:47:22 CDT