Haven't had a chance yet to take it to an alignment place, but did check the axle.
The axle looks bent upwards in the centre. Laid a 65cm strait edge against the bottom centre and there's about a 6mm gap in the centre. But from the centre to the frame it measures straight. The brackets attaching the axle to the frame also seem to be bent slightly inward to compensate? But that's just by eyeball.
The camber/tread wear problem is only on one side though while the axle bend appears to be precisely in the middle. Could the bend be normal, deliberate? Perhaps to compensate for some reverse play at the axle/torsion lever, torsion lever/wheel attachments?
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