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@clubman
Taking the wheel size as 27", 52 x 14 gives 100.3", whereas 53 x14 gives 102.2", I doubt whether anyone could tell the difference.
If the chain jumps, it's usually the block (cassette) sprocket, or the chain that's the problem. Of course, if the chainring is visibly worn it should be replaced, but the rest of the system probably needs changing.