The cyclist, a 65-year-old local man, is currently very poorly in Airedale General Hospital after he collided with a silver Renault van on Skipton Road at around 12.15pm on Thursday 25 October 2012.
Investigating officers believe that the driver of a small blue Mercedes car which overtook the cyclist just prior to the collision may have information that could help them with their enquiries.
Traffic Constable Dave Clayton, of Skipton Road Policing Group, said:
The Mercedes had nothing to do with the collision but having passed the cyclist just prior to the incident, the driver may be a vital witness.
I would also appeal to anyone who witnessed the collision itself or saw the cyclist or the van prior to the incident, to get in touch as soon as possible.
Anyone who can help officers with their enquiries is urged to contact North Yorkshire Police on 101 – select option 2 – and ask for Dave Clayton or Skipton Road Policing Group.
Please quote reference number 12120180195 when passing information about this incident.