The tallest wheel in North America is still the Texas Star at Fair Park in Dallas at 212 feet. It only operates during the State Fair of Texas, but it is a permanent wheel.
SFNE's wheel is an earlier Vekoma model that is slightly shorter than the rest at 150 feet. The newer Vekoma wheels stand 158 ft tall and can be found at SFKK and SFDL (it is not 165 feet as Darien claims). I thought Navy Pier had a newer Vekoma wheel at 158 feet too, but if Brad G. is correct then Navy Pier must have an older model.
At 184 feet SFSL's Colossus is most likely the second tallest wheel North America, and probably the tallest at a North American theme park.
Touchdown said: I believe that Las Vegas is constructing a monster wheel that will be the tallest in the world once its built.
There had been talk within the last five years about them constructing this thing. It was supposed to be about 600 feet tall, with enclosed Gondulas holding as many as 20 people at a time, and the center of the wheel was supposed to be a convention center. However, I have not heard much about it recently and apparently it was supposed to be opened mid 2002, but since I haven't heard anything about it, I guess it is either delayed, or they cancelled the plan.