Transport plans for the city were launched in MP Sadiq Khan's campaign on Tuesday (March 29) to highlight the choice Londoners face when voting for the next Mayor.
The Labour hopeful put forward proposals to freeze Transport for London rail fares for four years on the same day Conservative candidate Zac Goldsmith pledged to introduce Boris Bikes to greater London should he be Mayor.
Mr Khan also took the opportunity to slam Mr Goldsmith's plans on tube fares.
He said: "Londoners face a crystal clear choice on fares. A four-year fares freeze if I’m Mayor – so you won’t pay a penny more in 2020 than you do today, o r a 17% rise under Zac Goldsmith – costing you up to £1,000 more.
"I know what I would choose."
The Labour candidate claimed Mr Goldsmith is basing his transport plans for tubes and buses on business plans which would see fares rise by 1% each year, costing Londoners more than £1,000 extra over the course of the next four years.
However, in a previous announcement made in Ealing , Mr Goldsmith said Mr Khan's proposals to take £1.9 billion out of the transport budget "would not only see London grind to a halt, but would make solving the housing crisis all but impossible".
The Tory campaign responded to Mr Khan's advert and said the "sums just don't add up."
A transport spate began in February when Mr Khan said he would freeze rail fares at a cost of £450 million to the London budget, but Transport for London argued it would be £1.9 billion , around four times as much as Khan had claimed.
The BackZac campaign said this £1.9 billion hole would mean Mr Khan would have to either hitch up council taxes, cut public services, increase congestion charges or scrap regeneration projects across the city.