It depends on your feet.
In most cycling shoes I'm a 46, they fit 'perfectly' when walking but a little loose when riding.
I got 46 Sidis and when walking they feel a bit too small/snug but on the bike they are PERFECT.
I think usually they come up a little bit small but I wouldn't go as far to say get 2 sizes bigger.
Your best bet is to try some on.
@MaxC started
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It depends on your feet.
In most cycling shoes I'm a 46, they fit 'perfectly' when walking but a little loose when riding.
I got 46 Sidis and when walking they feel a bit too small/snug but on the bike they are PERFECT.
I think usually they come up a little bit small but I wouldn't go as far to say get 2 sizes bigger.
Your best bet is to try some on.