Police have issued a CCTV image following an incident on Longsmith Street in Gloucester last month.
Officers would like to speak to the man in the image in connection with an altercation between a motorcyclist and pedestrian which took place at around 3pm on 11 October.
During the incident a pedestrian jumped out in front of a motorcyclist and tried to steal the keys to the rider's vehicle.
The victim, aged in his 40s, stopped his motorbike and was pushed by the offender; this caused his motorbike to fall on top of him which resulted in two breaks to his right leg.
Anyone who recognises the male is asked to call 101 or email firstname.lastname@example.org and quote incident number 281 of 11 October.