Offset is the same between various wheel widths, if the intent is to keep
the wheel centered in the well -- think about it. "Backspace" would change
based on wheel width.
Good question about measuring wire wheel offset. I wonder if the concept had
even been articulated in the wire wheel heyday -- rims were often narrower
than the hub, as in bicycle wheels today. At any rate the measurement is not
comparable to a bolt-on -- apples vs oranges.
But I am sure that is why the axles are different length -- the hub is much
thicker on a wire wheel.
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
on 1/27/10 6:02 AM, Paul Hunt at paul.hunt1@blueyonder.co.uk wrote:
> Stud wheels are easy - you simply measure the distance from the centre-line of
> the wheel to the face of the wheel hub that bolts up to the axle hub, which is
> usually flat. But what about wire wheels? It is measured to the back of the
> wheel hub or at the inner taper? And if at the inner taper is it the wider
> edge? The narrower edge? Or between the two?
>
> MGB wheel offset is usually given as '22mm approx', but doesn't it vary with
> wheel width in order to keep the wheel centralised in the well? 4", 4.5" and
> 5" widths were used at various times, my 5" Rostyles measure 26.8mm, and my
> 4.5" wires 20.45mm (to the middle of the taper). Shouldn't wire wheel offset
> be significantly less than steel or alloy? Isn't that why wire wheel axles
> are 1.75" (banjo) or 1.5" (Salisbury) narrower than stud axles?
>
> An enquiring mind wants to know.
> PaulH.
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