I think I've read about a lot of people complaining about wheels.. For example mine (and many others) are only gloss black on the face... the back of the alloy is CRAP. Some people have had re-sprays to sort this and also the flaking issue so I imagine it IS covered by warranty.. It'll just be a bit hard to get them to sort it. Get in contact with a local dealer and ask them, if they refuse, contact RUK customer services and have them take a look. Usually if you go straight to Renault after a dealer refusal they will sort it out but it depends on the situation.