This will be my first pair of climbing...
This will be my first pair of climbing shoes and I heard that all brands size different. Any idea what size I should be if I wear a 10.5 running shoe and an 11 casual shoe?
The best thing to do with a climbing shoe is to try them on in a local store, if possible. They sizes not only differ slightly between brands, but also between different models of the same brand.
I'd go for a ten. But if you can, do try them on.
I agree with Sam above me. I would NEVER buy a climbing shoe that I have not tried on. I have found that in some eVolvs I wear an 8.5. In my La Sportiva Nagos I wear a 7; and in Casual I wear a 9.5. I would try them on and then come to backcountry.com and take advantage of cheaper prices.