Police are trying to identify these two off road bikers following an incident involving an elderly man.
On May 10, a 77 year-old man reported that he had been subjected to cruel actions by the twio riders.
As the man was walking near the Cambrian Memorial in Cluydach Vale, they revved their machines to cover the man in stones and mud. He was left distressed by the incident.
Anyone who thinks they know who these riders are, should contact South Wales Police via 101 quotinf reference *163768 or call Crimestoppers anonymously on 0800 555 111.