DYFED-Powys Police are warning residents that there will be disruptions to the roads on July 2.
A statement released by the force said: "The Ras de Cymru Cycle Race will take place on July 2.
"It will be starting at Pont Ithel at 10.30am and continuing through Three Cocks, turning into Glasbury, through Boughrood, Llyswen, down the A479 and left onto A438 then left onto the A4079 towards Llyswen and finishing in the layby there at 1.30pm.
"The race will be marshalled by a lead car and motorbikes."