We heard you can get a bike on the Thames cablecar so we had to give it a go. The cabins are supposed to be able to take two bikes but Marilyns Circe Helios had to go in at an angle and then it was still a bit of a jiggle before the doors would close.
The views are fantastic but it is all over quite quickly. It runs from next to the Dome to the Royal Docks which makes it a bit rubbish as public transport but good as a fun way of making a circular bike route along the Thames. The River Bus also is very handy for bikes. You can join them up and make a nice muti-modal tour of London.