right|thumb|300px|Derny publicity material thumb|Derny Taon 125, 1955/1956 thumb|650cc Triumph TR65 Thunderbird "Stayer" first used at [[Leicester Velodrome in 1982 and now at Herne Hill Velodrome. Note the roller at the back and stood-up riding position that distinguish a Stayer from a true Derny.]]
right|thumb|300px|Derny publicity material thumb|Derny Taon 125, 1955/1956 thumb|650cc Triumph TR65 Thunderbird "Stayer" first used at [[Leicester Velodrome in 1982 and now at Herne Hill Velodrome. Note the roller at the back and stood-up riding position that distinguish a Stayer from a true Derny.]]
A Derny is a motorized bicycle for motor-paced cycling events such as during six-day and Keirin racing and motor-paced road races. Some riders train behind a derny on the road. The Derny is so-called as it was originally produced by the French Derny firm, but the name Derny is now applied to all small cycle-pacing vehicles, regardless of manufacturer.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).