Wheelie bike speedometers, windshields, hand grip streamers, headlights, taller sissy bars, axle spinners, and back rests such as shown on this bicycle: The Raleigh Chopper was the best selling children's bicycle in the UK. The wheelie bike fad drove bicycle sales to over 4 million units in the US, and accounted for 75% of total US bicycle sales in 1968, but it also helped contribute to the impression in the US that bicycles are merely children's toys. Dangerous features, such as shifters mounted on the top tube, were banned in the US in 1974. The wheelie bike fad even attracted the attention
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