From a distance the North Rib of Mount Tyndall looks intimidating, but upon closer inspection it's a fairly straightforward hike/scramble up relatively stable rock. Once you are on the rib, it's easy to discern the path of least resistance and stay on Class 3 terrain. There is optional Class 4 terrain, however, which you can take for more direct and more exciting variations.

You will more or less follow the crest of the rib until the top, where it joins the summit ridge. When approaching the top of the rib, you should trend left to reach an obvious notch in the ridgeline (there is another obvious notch to the right, but reaching it is more difficult). Once crossing through the notch, it's easy boulder hopping the rest of the way to the summit.