vortextubesYou can go down a size. I wear 13's too, and I have both 12/13 in Thorogoods. It also depends on the socks you wear.
If you like thicker socks, stick with 13, if not, I'd try the 12's. I have 6 pairs of TG's and half are 12 and half are 13.
Also, you can use/not use insoles if you like.
I have these in Natural, and they are 12's. Perfect fit.
HTH.
vortextubes12.5. I usually size down 1/2 size on all thorogoods. You can go one full size down, and they will stretch, but I prefer to have a more roomier toe box.