Provided that you've fitted a tyre size as specified on the placard, with the correct minimum speed/load rating, then my understanding is that it doesn't matter whether you've got runflats or regulars. But it's best to talk to your insurer Duncan. Different insurers have different policies wrt modifying from stock (NRMA springs to mind here).
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08 BMW 135i Sport Coupe | Manual | Sparkling Graphite | Coral Red Boston Leather | 10 Speaker Hi Fi
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