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.
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.