Trek bikes are primarily manufactured outside the United States, with most frames produced in Taiwan, Cambodia, and China. High-end carbon frames are made in Asia and then shipped to Trek’s headquarters in Waterloo, Wisconsin, for painting and assembly as part of their Project One custom bike program. However, no full production Trek bikes are currently made in the U.S. since around 2017

. At Trek’s Wisconsin facility, there is a significant carbon development laboratory where some high-end carbon frames, such as the Madone 9 Series and certain Domane models, are made domestically. This facility focuses on advanced carbon frame manufacturing, involving both human and robotic work, but this represents a smaller portion of overall production

. In summary:

• Most Trek bike frames are made in Taiwan, Cambodia, and China.
• High-end carbon frames are produced in Asia and assembled/painted in Wisconsin.
• Trek’s U.S. facility in Waterloo manufactures some high-end carbon frames but no full production bikes.
• No Trek bikes are fully made in the U.S. anymore; production shifted overseas by 2017