But the idea isn't that far-fetched for Meg McClintock, 9, Sean McClintock, 12, and Finn Cloudsdale, 8.

Living in Evandale, the home of the National Penny Farthing Championships, they are exposed to the old-fashioned bicycles all the time - Meg is even a national champion rider.

Meg and Sean's father and Finn's uncle Jeff McClintock is the operations manager of a charity operating in Bangladesh called Symbiosis. Their mother/aunt Leah McClintock volunteers as an optometrist with the organisation, and Meg was actually born in Bangladesh, right before the family relocated to Tasmania.

IN OTHER NEWS:

When an opportunity arose for some Bangladeshi members of the organisation to complete training in India that would enable them to give the gift of sight to thousands, Meg, Sean and Finn clicked straight into gear - and the result of their brainwave is surely one of the oddest fundraising efforts in Tasmania in recent years.

"Symbiosis does aid and development work in Bangladesh - it's been doing that for more than 25 years," Mr McClintock said.

"One of the projects is called Specs - Symbiosis Primary Eye Care Service. It's ongoing and has helped thousands of really poor people, particularly living in remote areas, to access eye care. It's something that we kind of take for granted here, but in a country like Bangladesh, [eye care] is out of reach for lots of people."

Specs provides both preventative advice and treatment in eye care, with the organisation staffed mostly by Bangladeshi people. A school in India has offered some of Symbiosis' optometrists further training for free - but they still need funds for passports, visas, and travel costs to get to India.

So Mr McClintock's young family members didn't hesitate in putting their hand up to help.

"We feel really close to it, especially since both my parents work for Symbiosis and Specs," Meg said. "We just feel our whole life has been influenced by that, and we feel that it's something that we'd like to help with and join in with."

They aim to collectively ride 100 miles (160 kilometres) around the Northern Midlands on loaned penny farthings, and are asking the community to sponsor their fundraising endeavor at givenow.com.au/100mileride