Dimensions and quantities:
Diameter, weigth, width of wheel, width of wheel at ground surface, height of drop, resistance on the ground, number of parts, durability of wheel in a fall, friction at the rolling surface.
What makes a good design?
Quality of Concept, build quality, simplicity, logical, correct balance of relative sizes, quality of materials.
What makes a winning design?
What is the list of requirements for this project?