They are 26.7 inner no 27 as the say but very nice and strong. I built a nice set of wheels, I tried to break them in my first ride without any success! I love them so much that I bough 3 pairs more. I’m arrive in 15 days! Yes wow!
In the description photo it says that it has 27 mm inside and it is not like that, it has 26.7 mm.