Cheers - I checked the wheel bearings when I had it apart and they felt fine. Very smooth with no roughness or play.

They are SKF bearings and were replaced 10,000 miles ago so should have some life left in them.

I'm also pretty particular about chain adjustment (I use a metal ruler to set them).

Looks like I'll be replacing the bearings fairly soon - as I can't see any other reason for the side-to-side flex. I suspect the fritzed cush drive rubbers may have put too much load on them.

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Simon

Brighton, UK