Hi,
I think Adidas shoes are sized in men sizes (6, 7, 8...).
Not sure what the conversion would be, but I own all Adidas cycling shoes and they are all 6.5 - while my regular everyday shoes are 7 or 7 1/2. Not sure this may help you - you could also try some of the online vendors and see if they have sizing charts, sometimes they do. Try Excel sports and Nashbar, they may have sizing charts that compare the different brands.
Could you ask your local bike shop to order that model in two or three different sizes so you can try it?