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@pifko
What with the chainset having standard gearing, it will be 130BCD and I dont think you can fit anything smaller than a 39T on that (38T with some modification?).
You'll need a 'compact' chainset (110BCD), which are normally sold as 50/34T.
You could always replace the 53 with something smaller, but you'll still be limited by that 39T.
Note that you might need to sort out a long cage rear dérailleur of you change to a compact chainset.