Frank Nasworthy started to develop a skateboard wheel made of polyurethane, calling his company Cadillac Wheels. Prior to this new material, skateboards wheels were metal or "clay" wheels
he invention of the no-hands aerial (later known as the ollie) by Alan Gelfand in Florida in 1976, and the almost parallel development of the grabbed aerial by George Orton and Tony Alva in California, made it possible for skaters to perform airs on vertical ramps.
Skateboarding during the 1990s became dominated by street skateboarding. Most boards are about 7 1⁄4 to 8 inches (180 to 200 mm) wide and 30 to 32 inches (760 to 810 mm) long.
By 2001 skateboarding had gained in such popularity, more participants under the age of 18, rode skateboards (10.6 million) than played baseball (8.2 million), although traditional organized team sports still dominated youth programs overall.