Wheelie bikes are also called Muscle bikes, High-Riser bikes, Spyder bikes and Banana bikes. Designed in the 1960’s to resemble the Chopper motorcycles with ape hanger handlebars (wide, easy to see through, with high grips), banana seat with sissy bars
(long seats that could accommodate a second rider with a metal backrest at the rear) and 16-20 inch wheels (the larger one in the back). Al Fritz designed the Schwinn Sting-Ray which was released in 1963, other companies, like Sears, would follow upon their success. I got a Sears Spyder bike for Chistmas in the 60’s and it was my favorite.