bump, I need the same question answered.
I have 45 Sidi's and need to know what size of Nike's. I live in Montana away from anywhere and can get a good price on Nike's, Thanks

I had a Sidi size 9 US and it was a perfect fit. Now I wear a Nike Poggio 2 and the 9.5 fits just fine. In fact the Nike shoes are abit more comfy and stiffer(sole) which I like a lot.
I hope it helps.

So you're saying that the Nikes are a smaller fit than the Sidis?

I've heard that the Nikes are made by DMT, so the sizing might make sense.

something interesting that might help:

http://www.sidiusa.com/...us/SIDIShoeSizer.pdf

n=1
I had some Sidi t1 size 44 that were too narrow in the front. I bought some Poggio size 43 (9.5) that fit me perfectly. All my Nike running shoes are 44 (size 10).

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I have Sidi Genius in 48, and they run snug, sponsorshi with Nike put me in Altea Plus and Mountain 101. Nike's are stiffer and more comfortabe - I wear 13. I would say a half size to a size difference.

Go to a Trek store and try a pair on

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bump