Any Idea what would cause this? Tire wear

[Richard J Lebens]

1991 90 Quattro 20 valve.

Symptom - Right front tire is suddenly (?) worn on BOTH outer edges. 
It is like it was run under inflated, but it wasn't (34 psi).  Other
same aged tires have 70% tread wear left  (right rear might be slightly
more worn but worn evenly).  Car drove fine till I noticed what felt
like an unbalanced wheel which must be the cords coming apart

What I've checked - Control arm bushings don't give when I put a bottle
jack under them.  Rear subframe bushing has about 1/8 th inch vertical
play in it (axial) before the car starts to lift when jacking on the
subframe, front bushing no play.     No play in the wheel side to side
or top to bottom, pulling and pushing manually.  The tie rods seem to
be tight and have the same movement as the wheel.  

Should the plate on the top of the shock strut ( called bump stop in
manual) be 3/8ths inch above the fender well sheet metal (under the
hood) and go down to the metal when you push down on the wheel?  Is the
way to test strut bearings to jack the car up and push pull on the top
coil of the spring?  Shocks aren't leaking and seem to damp rebound.

Any help would be greatly appreciated cause I am stumped.

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