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Free Shipping. Yates Big Wall Ascenders (Fall 2007) Designed for strength and ease of action, Big Wall Ascenders by Yates comes with thumb release on cam, large molded hand grip and double clip-in points. Unique cam design allows for high strengths when tested on various ropes. At primary rope sheath failure, ascender is still fully operational. Big Wall Ascender is the strongest ascender on the market! Yates Big Wall ascender accommodates 9-13mm ropes. Weight: 12 oz/350g. Strength: Frame 6000lbf(26kN). 10.5 mm Climbing Rope: 1900 lbf(8.5kN). 7/16in.(11mm) Static Rope: 2000 lbf(9kN).