What is the biggest Ferris Wheel?

the London eye
new york giant wheel 267 meters tall
The tallest Ferris Wheel would be the brand new one in just opened in Singapore. The 42-storey-high wheel began its slow revolutions under hazy and partly cloudy skies at about 1055 GMT on 11th February 2008

At 165 metres (545 feet), the Singapore Flyer is 30 metres higher than Britain's London Eye. Dubai is building one hat's 185m... 50 meters higher than the London eye..
Pretty soon we'll have a 1/2 kilometer wheel.. who knows

There are also plans to construct the Great Berlin Wheel and the Beijing Great Wheel, which will both be taller than the Singapore Flyer.