A lot of times this caused by tire separation. They separate
internally and can be hard to detect. The easiest way is to run your
hand around the tire and you will feel flat spots. Also you must pay
close attention to age of your tires. We have an article coming out
soon in Healey Marque that covers tires and tire dating. Tires
should be replaced about every 8 years no matter what the wear due
to the tires getting hard and starting separate internally.
Its not worth having a tire come apart while driving just to try and
get a few more years out of a set. There was a club member killed
several years ago due to tire separation and causing a fatal accident
so lets all be safe out there and pay attention to the age of the tires.
David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767
www.britishcarspecialists.com
.
.
On Aug 13, 2008, at 5:21 PM, James Lea wrote:
> In the last few months I have developed a shimmy that starts at
> fifty MPH
> and gets worse as the speed increases. Several good mechanics have
> looked at
> it. One said the front end was out of line. One said the front
> tires were
> out of balance. I checked both front tires on my bubble balancer
> and they
> were both right on.
>
> Today I had a flat on the left rear. I put on the spare and the
> shimmy is
> GONE!! I inspected the tire and found it scalloped but only for twelve
> inches in one section near the edge of the tread.
>
> Weird! What would cause a rear tire to scallop like that and would
> that
> effect the entire car and cause the shimmy? Tomorrow I am going to
> put the
> flat rim on the car, jack up the rear end and see if the rim might
> be out of
> round or not running true. Cheers, JL
>
> James Lea
> PO Box 25
> Rockport Maine 04856
> 1-207-236-3632
>
> 1951 Triumph Renown
> 1952 MG TD
> 1952 Triumph Mayflower
> 1958 Rover P4
> 1962 Austin Healey BT7
> 1980 Commuta-car Electric
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