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
2010 Rig Single Speed - Bike Archive - Trek Bicycle
58cm Single Speed TREK District Aluminum/Carbon Road Bike 5'11"-6'2"
A Closer Look: 2009 Trek District Singlespeed | One woman. Many bicycles.