1989 was a pivotal year for Trek, marking the year that the company unveiled its first molded carbon fiber frame, the Trek 5000. The 5000 frameset (monocoque carbon frame plus bonded aluminum fork) had an advertised weight of 3.3 lb (1.5 kg). Designed by Trek but built by Brent Trimble, an outside manufacturer, the 5000 suffered enough quality problems that it was discontinued after just one year. But the lessons learned from the 5000 would prove to be instrumental in driving Trek to develop its own carbon manufacturing capabilities in the coming years.