Beijing: Frustration with being continually late because he couldn't find a carpark convinced Donald Tang, 33, that Sydney needed to embrace Asia's digital bike-sharing boom.

The University of Technology, Sydney graduate says there are some places, like Darling Harbour, where city workers can't even catch a train or bus to the office.

Donald Tang founder of bike sharing new Sydney start-up ReddyGo. Credit:Steven Siewert

Mr Tang's start-up, Reddy Go, will place red bicycles wth GPS tracking at train stations around the Sydney CBD in July.

The bikes are located and unlocked with a smartphone app, and will cost $1.99 for 30-minutes. They come with a helmet, and can be left wherever it is legal to do so.