Raleigh Bicycle Company introduced in 1973 and only available in a bizarre shade of pink. This model was discontinued in 1976. The Mk 2 had a shorter seat and the frame modified to move the rear of the seat forward, this helped prevent the bike tipping up. The shorter seat also made it harder to ride '2 up' (2 people on the bike at a time). The "Chopper" remained in production until 1982, when the rising popularity of the BMX bicycle caused sales to drop off. Raleigh revisited the chopper design in recent times, with great success although the new version has had
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