Prepping for a rally next month and I notice that both the
Mk II and the E have some broken spokes (both original
chrome curly hubs, spokes all snapped cleanly at the hub
end). Yes, I will have them fixed, but I’m wondering how
many spokes can be broken without massivly compromising the
integrity of the wheel?
Presumtions:
normal driving (no power drifting, high speed etc)
even distribution of broken spokes (i.e. not 10 all in a
row).
Andrew–
1968 3.8S
Zurich, Switzerland
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Short answer: none.
The spokes opposite and right next to the broken ones get a lot of stress
like this, and the spokes broke for a reason; maybe the spokes next to the
broken ones, or opposite ones had too little tension on them.
Contrary to common belief, wirewheels do wear out. Driving with wheels with
broken spokes will cause more damage, if your wheels are the originals,
you’ll be amazed how well the car will behave with new ones. Also, you
really don’t want to suffer a total collapse of a wheel.
New curlies are available from stock from MWS and not prohibitively
expensive.
Cheers!
Jack Verschuur
(Agent for MWS for Southern Africa)
Prepping for a rally next month and I notice that both the
Mk II and the E have some broken spokes (both original
chrome curly hubs, spokes all snapped cleanly at the hub
end). Yes, I will have them fixed, but I’m wondering how
many spokes can be broken without massivly compromising the
integrity of the wheel?
Presumtions:
normal driving (no power drifting, high speed etc)
even distribution of broken spokes (i.e. not 10 all in a
row).
Andrew
1968 3.8S
Zurich, Switzerland
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In reply to a message from wirewheels@absamail.co.za sent Sat 21 Aug 2004:
Jack,
Thanks. I sort of thought that would be the answer. I
both cars had about 5-6 spokes per wheel replaced about 6
years ago, but I think that they were just replaced (as
opposed to truing the rims and setting all the spokes). The
tension varies a bit, judging by the note that the upper
spokes make when struck lightly with a spanner, so I suspect
that both vehicles need truing. As far as I can tell the
worst wheel has 4 spokes broken, evenly distributed around
the wheel.
Budget constraints face me with the decision between
just having damaged spokes replaced now and a proper job
later, or blowing the budget this year and having them all
done now, prohibiting any winter projects. Spokes alone are
about 5$US each here, and I would prefer to replace them all
at once, so it isn’t going to be cheap.
Is there any point whatsoever in my trying the following
myself: Replace any broken spokes, tighten any loose until
they all make the same note - this presumable with the wheel
off the car, or by rotating the wheel 1/8 of a turn with the
weight of the car on them, adjusting only those in tension.
That the adjacent spokes take the additional load I can
see, but how does this affect the ones opposite the broken
spoke? I thought a wire wheel hung from the upper spokes
and the lower ones just went into tension when a side load
occurs.
Andrew–
The original message included these comments:
Short answer: none.
The spokes opposite and right next to the broken ones get a lot of stress
like this, and the spokes broke for a reason; maybe the spokes next to the
–
1968 3.8S
Zurich, Switzerland
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In reply to a message from Andrew Waugh sent Sat 21 Aug 2004:
Andrew,
Part of the problem is chroming spokes and not getting them heat
treated to avoid hydrogen embrittlement.
Which causes them to break.
Which is where my technical knowledge of that starts to run out.
Also you would need a spoke spanner to adjust them.They are a
tight fit on the flats of the nipple and small enough to get in
where required.
A friend who rebuilds spoked wheels says he prefers the spokes
with Philips head nipples as he can use a cordless drill with a
torque setting to set up the spokes to the same initial setting
easily and quickly, and therefore cheaply.
I has seemed to me that the short spokes break more easily.–
Ed Nantes SS
Melbourne, Australia
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In reply to a message from Andrew Waugh sent Sat 21 Aug 2004:
Hi Andrew,at $5 US/spoke I would just buy new wheels. On the
other hand, having only the broken spokes replaced and the wheels
trued would be less costly.-FWIW—GNB–
The original message included these comments:
Budget constraints face me with the decision between
just having damaged spokes replaced now and a proper job
later, or blowing the budget this year and having them all
done now, prohibiting any winter projects. Spokes alone are
about 5$US each here, and I would prefer to replace them all
at once, so it isn’t going to be cheap.
–
DAIMLER : V8 SALOONS SAFELY FAST IN AIR SMOOTH STYLE
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In reply to a message from GNB sent Sat 21 Aug 2004:
I replaced 2-3-4 broken spokes per wheel on my car when I first
bought it. I had some trouble finding the right spokes until I
photo copied and faxed them to a couple suppliers. I got stainless
steel at about $3 each USD.
I was able to replace the spokes with the wheel off the car and
leaving the tire on the car, except 2-3 which broke off in the
nipple.
There were 2-3 spokes that were just 1/8’’ too long and had to be
shortened with a file to get them to start threading into the
nipples.
I then tightened them to sound pretty much like the other spokes
and I checked the tone of each spoke again after driving a couple
miles.
Total job was under $35.
P–
Peter J. Smith, 1966 3.8S, 67 MGB
carson city nevada, United States
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