London Assembly member Darren Johnson has obtained data on modelled fire response times before and after the proposed cuts come into force.
The following wards will see first response times worsen by over a minute.
More top news
Tubes, trains, trams, buses, cable cars, river buses, taxis and going by foot - your guide to getting around during the strike.
Union officials rejected a revised offer from Underground managers during a meeting at the conciliation service ACAS this afternoon.
Train drivers were offered £200 a shift to work on the new 'Night Tube' in a bid to halt the threatened walkout.