Hi Preachan - are these D.I.D. rims by any chance? And have you been out in the winter salt? Don't want to scare you but if they're DID's then bin them and buy new rims.
I bought an XTZ 660 from new and the same thing happened mine. I remember shortly after the first tyre change I had a blow out. I took it back to the tyre fitter and we looked at the tube together. It had a big cut from a sharp bit of flaky metal on the rim. All I could do at the time was wire brush and emery it smooth.
Towards the end of that year the rear wheel felt wobbly. I checked the spokes and a number where loose. Taking the tyre off this time showed the rims had got a lot worse inside. The more you poked at them with a screwdriver the more flaky bits would break away.
I rang James Weildon in England and talked to him, he more or less told me those rims are pure sh*te. Salty water gets in past the nipples and eats away at the aluminium. He built my hubs into Morad rims with stainless spokes. That was 12-13 years ago and the bike has been in constant use every winter. The rims only get a clean when I'm putting tyres on but they are absolutely fine inside. No corrosion whatsoever.
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