Got a bike you're not using?

Unwanted bicycles in Bunbury are being gladly accepted by a Perth charity to improve rural transport in Africa.

Not-for-profit organisation Bikes for Humanity is taking about 20 bicycles that have been collected by police and repaired by Bunbury prisoners.

Bikes for Humanity WA chairman David Tucker said the bicycles would be fine-tuned in a Perth workshop before being shipped overseas.

Mr Tucker said the bikes were delivered to charities based in Africa that had set up a series of maintenance workshops.

The workshops - known as Bicycle Empowerment Centres - are based in Namibia and Zambia.

Bikes for Humanity has already shipped out eight containers, each carrying about 350 bikes, and aims to transport at least two containers every year.

"We need about 700 bikes a year and any contribution to that is fantastic," Mr Tucker said.

"We are talking about people who are living in rural parts of Africa.

"They (the bikes) are going to areas where there aren't too many roads, very few cars and people walk.

"A bike will take people twice as far, twice as fast and will carry four times the load."