[MBZ] Strange Front trye wear pattern

[Peter Merle]

On my W123 the front tyres , both  are exhibiting a strange wear pattern
where the outer blocks have a kind of saw-tooth pattern. Had alignment
checked and rotated tyres and now the previouslyly rear tyres are doing
the same thing. Shocks are new Bilsteins. Ball joints and arms are all
new. Any ideas
Peter