Du-Bro Tail Wheel 1" Diameter Part No: 100TW. Du-Bro Tailwheels look great and have a machined one piece aluminum hub. They are molded solid for unmatched durability and strength and are preferred by professional pilots worldwide. These also have many more applications in school projects and various crafts. Diameter: 1.00" (25 mm), Axle Diameter: 3/32"(2 mm), Weight: 7 grams/wheel, Width: 0.450" (11.4 mm).