Beloit police are investigating a hit-and-run crash involving a bicyclist. Police are examining some of the vehicle parts left behind after the crash about 10:30 p.m. Wednesday in construction along the 2600 block of Milwaukee Road. They say the suspect vehicle is most likely a pick-up or SUV. Perhaps a Chevrolet or GMC. Officers say the 41-year-old man riding the bike was critically injured.