Toronto's mayoral contest has narrowed sharply, according to a new survey conducted for CP24 and CTV News Toronto by Nanos Research among 757 Toronto residents between October 8 and 10.

Among decided voters, the poll found 50.8 per cent support for Olivia Chow and 47.3 per cent for Brad Bradford. Including undecided voters, Chow stood at 42.8 per cent and Bradford at 39.3 per cent, with about 17 per cent yet to choose.

Nanos founder Nik Nanos said Chow draws strength from Toronto and East York, women and voters under 55, while Bradford performs better in North York, among men and among voters 55 and older. Scarborough was described as closely split.

The survey also found a city divided on bike lanes: Chow voters prioritised TTC investment, Bradford voters favoured congestion relief, and support for bike-lane expansion split sharply between the two camps. The poll carries a margin of accuracy of plus or minus 3.6 percentage points, 19 times out of 20.