Upper Hutt's mayor is calling on the community to dob in two dangerous motorcyclists

Police say they're been getting good support from the public in their effort to identify the bikers, who were recorded at speeds of 300 kilometres an hour on Saturday.

Mayor Wayne Guppy says someone must know something, and they have a responsibility to speak up.

He says the bikers will have been bragging to friends - and if that's you, you need to dob them in.