"It is fun and free and encourages us all to experience first-hand the joys and benefits of riding a bicycle," Mr Gruebsch said.
Individuals or organisation can sign up at www.aotearoa.bike. Prizes include trips to Croatia and British Columbia.
"You don't need to be a cycle warrior to take part. You may wish to enjoy a leisurely weekend ride with your family on our new shared pathways, or a regular ride to work during the summer.
"We're hoping that together we can get 10,000 people on bikes across New Zealand."
The challenge includes features like automatic tracking GPS apps, individual badges and goal tracking, lots of individual and team prizes, leader boards and more.
More information is available at www.letsgowhanganui.org.nz.