Generally, if you can lift your shade using one hand, Gear will be strong enough to lift your shade.

Gear can easily lift up to 10 lbs, far exceeding the weight of a typical window shade. In fact, legal requirements are for chains to break at 10 pounds of force to prevent

choking and strangulation hazards.
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To compare, most window shades found in homes require 7-8 lbs of pull force. Larger window shades and curtains (think floor-to-ceiling condos) require 10-15 lbs of pull force.

It has also been tested to lift window coverings that are 9 feet by 9 feet.