Came across This Post talking about track bikes being pulled by motorcycle which I thought was interesting. Turns out it not unheard of…
“A Derny is a motorized bicycle designed and built for motor-paced track cycling events (eg: motor-paced races in six-day and Keirin racing) or motor-paced road races.
“It is driven by both a 90 cc engine and by being pedalled through a fixed gear, typically of 70 teeth on the front chainring and 11 on the sprocket on the back wheel. The combination allows for smooth acceleration and slowing, important when the front wheel of the rider taking pace is only centimetres from the pacer’s back wheel. A further feature is a coupling between the motor and the back wheel which ensures that the machine will not stop dead if the motor stops or seizes up.”
“On a Derny, the driver sits close to the back of the bike in an upright position to provide an envelope of low wind resistance for the cyclist ‘drafting’ or slipstreaming behind. The machine has to be pushed and bump-started. It can then pace riders up to about 90 km/h, although speeds in races rarely exceed 80 km/h.
“For most derny races, the cyclist sits in the slipstream of the derny for the duration of the event.
“In Keirin track races, common in Japan and now familiar elsewhere (the event features in national and world track cycling championships), the derny is used to bring several riders up to speed, at which point the derny pulls off and the race finishes in a sprint without the pacer.”