Brisbane cycling advocates believe the council "hasn't tried very hard" when reviewing a proposal to implement a grid of protective bike lanes in the CBD.

Space4cyclingBNE submitted a proposal to implement bike lanes on George, Edward, Ann, Margaret and Herschel streets along with a petition containing almost 3000 signatures.

Space4cyclingBNE submitted a proposal to implement bike lanes on George, Edward, Ann, Margaret and Herschel streets.

Spokeswoman Belinda Ward said the proposal would meet big demand for improved cycling conditions in the city and encourage commuters to use bicycles.

"Commuters said the last bit into central city was too scary for them to ride," Ms Ward said.