Answer:
The biggest bin can be split into a number of things. Amount of storage , height and diameter.
As far as I know, there is one bin that wins two of the categories. It's a bin made by a company called Brock. It's 156 ft in diameter (across), 70 ft high at the peak and can hold op to 1.34 million bushel of grain. Another Brock bin that's only 132 ft across can be built as tall as 98 feet.