Feature●Width: 5", Height: 5", Neck: 3", Tread: 2-5/8"●Engraved/Aluminum●Challenger engraved twisted lightweight aluminum stirrups allows your foot to be flat across the tread which gives you a more comfortable ride without the stress on your knees.●Width: 5 1/4", Height: 5", Neck: 3", Tread: 2 5/8"Description Challenger engraved twisted lightweight aluminum stirrups allows your foot to be flat across the tread which gives you a more comfortable ride without the stress on your knees.