The Emirates Air Line – as it is officially named – will see a cable car between the Greenwich Peninsula and the Royal Docks.
Construction began on the £60 million cable car system in August 2011 and the original aim was for an official opening in late Spring.
However, when asked yesterday, Transport for London was unable to say it will be ready in time for the Games.
The controversial project has seen its costs balloon from an early estimate of £25m, which would have been entirely funded by its sponsor. There has also been disquiet about the Emirates name – a commercial organisation – appearing on the London Underground map.
The 36 'gondolas' which will transport tourists across the river are currently undergoing load tests where 700kg weights are being used to simulate 10 passengers.
According to TfL, the cable car system could provide a crossing every 30 seconds and carry up to 2,500 passengers an hour in each direction — the equivalent of 50 busloads.