I would say that if you have more than enough room at the tip of the shoe, I would go down to the 41. The shoe will not be longer, just that the toe cap will have a little more room around the sides of the toes, letting it come forward more. Since the toe cap on the Ergo 3 was/is very tapered, some had to move up 1/2 a size to accommodate for this. This is not needed on the Wire.
If the Ergo fits like a glove now, I would say get the same size.
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