27m, 2 pitches.
Either starts at the lowest point of the rib or 2 meters right at a small corner.
1) 9m. Follow the rib as it makes the crescent shape to a belay at about 9m on a scooped ledge.
2) 18m. Go straight up on over many small ledges with minimal protection until a big grassy ledge with a flat boulder as belay anchor. (the original route carries on up thin crack but this would change the grade. )