Digging up an old thread because I could not find the information I wanted regarding Step Steel blades, so I am sharing my findings. So after a quick call to Step... "Al"l their blades are profiled to a 10ft Radius, with a neutral/slightly forward pitch. Also, the Speed XL (Xtra Long) runners which fit on the Tuuk lightspeed holders run 5-7mm longer than what comes stock on your skates. For example, my Nexus 800, size 7 come with 263mm runners 9ft radius stock... if I order Step XL Steel Runner at 263mm, I will get a runner that's profiled to 10ft, neutral pitch and 5mm more blade on the ice.