Offset when welding wider rims on steel wheels

[alfacybersite <acs@xxxxxxxxxxxxxxxxx>]

This is a repeat with a different Subject head. I just received a question
from a Digester to my earlier question. Surely, someone knows the answer.
Jump to the last two paragraphs for the question.

************

> In #558 Peter_van_Kooij comments and asks: "The question was asked, what
> is the maximum tire size for a spider. I think I have a pretty good idea
> now, and assume this goes for a '68 Duetto just the same. I am wondering
> what the original tire size was for a Duetto. Mine has 15" wheels that
> look stock, but I would have expected 14" rims."
>
> ***********
>
> Peter, I'd guess 205's would be too wide for your 4.5" rims. Apparently
> 5 and 5.5" rim widths were available for (I'm assuming this is what you
> have) the 1600 Duetto. Not sure how available they actually were.
>
> Yes, 15" is correct for your car. FWIW it should have the stainless
> hubcaps with the smaller plastic black ring. I highly doubt if your car
> is actually a '68. According to Fusi, Alfa had switched to the 1750 by
> '68, along with 14" rims (progress was different in those days, tire /
> wheel wise).
>
> If you're determined to go with wider tires, get four 15" steel rims in
> good condition, have a machine shop remove the 4.5's, and weld on the
> wider rims.
>
> Now, don't ask me how wide the 'new' wheels' rims should be (6"?) or
> what the offset should be so you have the ideal look of visually filling
> the wheel wells without having to cut off edges or rub on the inside.
>
> Bet someone on the Digest has actually gone through this process and can
> advise you. Should someone reply, it would be good to know if your car
> was lowered and if so, by how much.
>
> Biba
> Irwindale, CA USA
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