Found on http://carrosantigos.wordpress.com/
and I just found a post from http://goodsparkgarage.com from May 2012 that goes into a report on it
see more at http://goodsparkgarage.com/motorcycles-bicycles-in-motor-paced-racing/
where they do a thorough job of explaining the event, the reason the motorcycles are modified to have the rider over the rear tire, the handlebars so long, and the rider... up right. To punch a hole through the air the bicyclist could draft in.