Here's something I picked up from the HONDA-L Digest - 27 Aug 1996 to 28 Aug
1996.
Hey I know its is a rice box and not LBC, but I don't care where
my knowledge comes from.
Thought it might be of interest to some.
>------------------------------
>
>Date: Wed, 28 Aug 1996 10:00:21 -0400
>From: jgruener <jgruener@nando.net>
>Subject: wheel related shakes
>
>I just finished reading the "Vibration Troubleshooting" page from
>Dunlop's web site (http://www.dunloptire.com) and at the risk of
>copyright infringement I'd like to quote a couple of sections that may of
>interest to those of you with (tire) vibration troubles:
>
>***
>> While the up and down shake or bounce results from a heavy
>> spot in the tread, the side-to-side shake or wobble
>> (dynamic imbalance) can result from poor bead seating or a
>> heavy spot in a sidewall. If both front tires are affected,
>> the vibration will be added together when both tires are in
>> phase, and may go away completely after a corner, which
>> causes the outside tire to roll more than the inside tire.
>> This tire repositioning can cause the vibrations to cancel
>> each other. Soon, however, the tires will be in phase
>> again, and the vibrations will recur. Proper balancing can
>> correct vibrations resulting from heavy spots in tires.
>***
>
>How about that?! Especially that out of phase deal, which seems to happen
>to me quite often. I never could explain why the vibrations seem to come
>and go.
>
>***
>> An out-of-round (runout) tire/wheel, or a stiff spot in a
>> tire can cause vibration even in a perfectly balanced tire.
>> In these situations, forces create vibrations that are
>> present regardless of vehicle speed. Wheels don't have
>> force variation, but they all have some runout. Likewise,
>> every tire has some force variation. Each of these
>> variations, by itself, would not cause a problem but there
>> will be a vibration problem if the stiff spot or high point
>> of a tire happens to be placed at the high spot on the rim
>> during mounting. It is easy to avoid this condition. New
>> tires and rims are marked with dots or similar devices.
>> When these dots are matched, the high spot on the tire is
>> lined up with the low spot on the wheel, and vibration is
>> minimized (see Match Mounting).
>***
>
>Anyway, I think that this might help explain some of those "I've got this
>vibration but I'm sure the tire has been balanced and tires relatively
>new; what could be wrong?" situations.
>
>I highly recommend those with web access visit their site, or least look
>at the Vibration page.
>
>--Jamie Gruener
>
>
>----------------------------------------------------------
> James W. Gruener, System Engineer, The Marathon Group
>jamieg@margroup.com, jwgruener@aol.com, jgruener@nando.net
>
>------------------------------
John
John T. Blair WA4OHZ email: jblair@exis.net
Va. Beach, Va Phone: (757) 495-8229
48 TR1800 48 #4 Midget 65 Morgan 4/4 Series V
75 Bricklin SV1 77 Spitfire
The one with the most toys, wins!
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