Based upon what I had read and what my boyfriend has I'd say those are not the RTM81s. I would even say the 80. I was slightly interested in the 80 until I read that it doesn't have vertical sidewalls and doesn't bite as well on ice as the 81s. My guy has the 81s and he swears by them on ice.
Personally, I found the RTM 80 to be wonderfully stable. On ice, I liked them much better than the E84 I tried in the same length, and going to the next size up in length certainly helped.