The alloy wheels (17") on my 2008 Mini have bubbled quite badly, and when I had the tyres changed recently (to Avon non-runflat - very good compromise) I was told that one had a small crack. It leaks a couple of psi per week. Apparently BMW won't entertain corrosion claims - 'you didn't look after them properly'. Which may or may not be true - I do much the same as I've ever done, hand wash by the supermarket car park washing people, and never had this before. Anyway.
Not sure of the best way forward. One new wheel and refurb - maybe £500? SH off ebay? Or maybe these:
Cheers, Rob