I was a bit nervous ordering shoes online, especially since I find it hard to get shoes to fit. From heel to toe joint I am a size 7, but my short toes make my normal size a 6.5. I also have residual nerve pain from  surgery for a Morton's Neuroma almost  40 years ago. So I ordered a 7D. I have worn a 7D Brooks shoe before, but an Adrenaline 12. The reviews here suggested i might need to go to a 7.5, but I took a chance and 7D fits perfectly. The length is the same as my old size 7D Adrenaline GTS 12. But it is not as wide. But it still works for me. I wore them out of the box all day without any rubbing and found them very comfortable; in fact I am wearing them in the house too, and I usually throw off my shoes the minute I come in the door.

I didn't go for the updated Adrenaline for fear that it would suffer from the same lack of grip in the rain as the 12; the Ariel in reviews seems to have better grip, bit it hasn't rained yet, so I don't know.