"A number of conceptual links exist between bicycles and airplanes, so it is not pure coincidence that mechanical flight was invented by experimenters knowledgeable about bicycles. Many things contributed to the Wrights’ success with flight, but their familiarity with bicycles clearly was a factor."

https://airandspace.si.edu/exhibitions/wright-brothers/online/who/1895/biketoflight.cfm

"Before the Wright Brothers built their famous airplane, they built bicycles. On April 24, 1896, they introduced the Van Cleave. It was mostly handmade, and came with a special self-oiling hub. They sealed the bearings with felt washers, thus creating an oil reservoir inside the hub. This helped cut down on maintenance."

Aviation history : http://www.wright-brothers.org/History_Wing/Aviations_Attic/UFOs/UFOs.htm