A Closer Look: 2009 Trek District Singlespeed | One woman. Many bicycles.
Trek's Belt-Driven Single Speed | GearJunkie
15 Best Single-Speed Bikes for Riding Anywhere
54cm Single Speed Trek District Aluminum/Carbon Road Bike 5'7"-5'10"
Layman's London: The Trek District 2010 Single Speed Hybrid
Just finished the single speed conversion on this Trek 930. The tensioner is a jockey wheel bolted to a strip of aluminum bolted into the derailleur hanger. : r/xbiking
Trek T1 Track Bike rare single speed Bicycle Vintage – Fixed Gear Frenzy