A Brisbane cyclist has been linked to a five-year-long police investigation into 20 scratched cars in Toowong.

Investigators were appealing to the public for information regarding the alleged wilful damage incidents, encouraging any motorists who might have been targeted since 2018 to come forward.

Police released a photo of a cyclist, who they said was regularly in the area, with officers hoping to speak with the man.

Anyone who recognises the man is urged to contact police.