Rectangular trampolines are referred to as gymnasts’ trampolines. Few available most common trampoline sizes are 7x10ft, 8x12ft, 9x14ft, 10x17ft, 14x16ft, and many more.
The 7x10ft trampolines are good for small families and compact gardens. They are good for similar purposes as the 8ft and 10ft round trampolines. But they provide even bounce on all surfaces.
If you are looking for trampolines for 12 or 13 years old junior gymnasts then the 8x12ft and 9x14ft rectangular trampolines are quite good. They are good bouncers and need small spaces than the 12ft circular trampolines. These trampolines are good for use as in-ground trampolines though they have some problems.
Whenever you need the Olympic size trampoline then 10x17ft trampolines are perfect. They are not suitable for toddlers unless they are grown enough.
There are 18 ft trampolines too for sale. These trampolines need a large backyard as well as plentiful investment. They are good for general families and self-invented ball games like spikeball on beach trampoline.
The 14x16ft trampolines are almost square trampolines. They are good for ages 15 to 19+ and have enough spaces for wrestling, soccer. These trampolines are good for tumbling and practicing techniques.