Developed in the early 1920s, the Best Logging Wheeler’s sheer size made it a giant, with 8-foot wheels mounted on adjustable tapered roller bearings and 12-inch tires

http://www.caterpillar.com/en/company/history/leo/logging.html?utm_source=facebook&utm_campaign=CatProductsAccounts&utm_term=sf48205289&utm_medium=social&utm_content=Forestry&sf48205289=1
https://www.facebook.com/catproducts/

For more on big wheel logging: http://www.blackdiamondnow.net/black-diamond-now/2013/01/logging-with-big-wheels.html

https://forums.aaca.org/topic/341211-period-images-to-relieve-some-of-the-stress/page/632/