Wheelie bike of non-bicycle manufacturers that developed and sold add-on products, such as the Wham-O wheelie bar. Though initially a US fad, wheelie bikes also became popular in the UK, Canada, New Zealand, and South Africa. Australia had its own Malvern Star Dragster, ,Brazil had its own Monark Tigrão., and in Norway, Øglænd made the DBS Tomahawk. The former The Shaggs singer Dot Wiggin recorded the song "Banana Bike" in 2013 as a tribute to her sister Helen, who died in 2006. Helen owned a yellow imported Raleigh Chopper that she used to keep fit with, that Dot found amusing that a
Bicycle suspension Horst Leitner began working on the problem of chain torque and its effect on suspension in the mid-1970s with motorcycles. In 1985 Leitner built a prototype mountain bike incorporating what became known later as the "Horst link". The Horst Link is a type of four-bar suspension. Leitner formed a mountain bike and research company, AMP research, that began building full-suspension mountain bikes. In 1990, AMP introduced the Horst link as a feature of a "fully independent linkage" rear suspension for mountain bikes. The AMP B-3 and B-4 XC full-suspension bikes featured optional disc brakes and Horst link rear suspension very