Stone wheel in a trough (by Vincent Jones, CC-BY-SA)
Wagon wheel (by Richard Sonnen, CC-BY-NC-ND)
Steamroller (by Rog Frost, CC-BY-SA)
Car wheel (by Mr T. in DC, CC-BY-ND)
Bicycle wheel (from Soil-Net, CC-BY-NC-SA)
Bulldozer tread (by John Schilling, CC-BY-NC-ND)
Eggbeater (by Candice Wouters, CC-BY-NC-ND)
Table saw (by Patrick Fitzgerald, CC-BY)
Wheel of Fortune (by Paul Stack, CC-BY-ND)
Ferris wheel (by Josh McGinn, CC-BY-ND)
