As companion pieces to swing sets, climbing towers provide a different type of exercise. They are also relatively easy to install, and children enjoy them. We have tried two basic designs. The totally metal towers are described here.
We recently installed a climbing tower using metal pipes (2″ ID) and 3 used tires. The pipes are 10′ in length, with 1.5′ buried in the ground and anchored with concrete. The tires are bolted to the horizontal poles and ornamental globes are welded to the top of each pipe.
Slightly more complicated designs are also possible.
A improvement to above climbing towers would be to add a tire at the base and filling it with concrete. This will add stability to the structure.
An important side benefit of the tire climber is it provides a use for old, used tires, which are a disposal problem in both developed and developing countries.