A section of the proposed cycleway on Griffith Avenue was previously ruled out on safety grounds, Dublin City Council has admitted.
However, the city council said the new plan to have a cycleway on road space has been made possible by the removal of parking and increased funding.
The council is in the process of providing a cycleway on the road space along the length of Griffith Avenue between Ballygall Road East and Malahide Road.
It will involve removing parking and reducing car traffic to one way in each direction - at present some sections have two lanes to allow turning.
These measures are opposed by some residents.
Independent Councillor Damian O'Farrell had pointed out that a previous proposal to put a cycleway on the section between Drumcondra Road and Charlemont Estate was ruled unsafe.
In a report to local councillors in 2019 the council ruled out using the road for a cycleway on that section stating: "Given that the demographic using the facility will be primarily younger children it is considered that the carriageway would be unsuitable".
The recommended option at the time was to allow cyclists to use the pavement.
In response the council said that local councillors on the North Central Area Committee did not agree with the report at the time.
Since then measures have had to be introduced because of Covid-19 and the feasibility report has been "superseded by events", it added.
"The two main obstacles to providing segregated cycling facilities on the carriageway identified in the feasibility report, namely funding and residents parking have been overcome.
"The provision of safe protected cycle lanes allows all cyclists including young cyclists to now use these lanes."