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wrote:

I have a DeWalt DC390 18v cordless circular saw. This takes 165mm
diameter blades on a 20mm arbour. I can't find any blade finer than
30 tooth to fit this saw. I have seen a Trend 48 tooth blade that has
the same size arbour (20mm) but is 160mm diameter (5mm less).

I have 2 questions. The first of course is if I fit the smaller Trend
blade, will it be dangerous? Secondly, will it give me the fine cut
that the blade is designed for?

Not all blades that are similar diameter are suitable. The blade
thickness, especially on very fine blades may be such that although
you can locate the blade, you cannot properly clamp it.

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