> I have heard of this with steel wheels, but should this really be
happening
> to alloys after just 18 months on the road?

Don't think of this corrosion like you would rust. You get corrosion when
you put two different types of metal together - there's just a reaction.

Only in extreme circumstances would a steel wheel rust onto a steel hub.

It really is very normal and nothing to worry about - ask anyone in a tyre
place. But get some copper grease to stop it happening again.

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