They're stiffer where they need to be stiffer, at the crown race where the fork meets the headtube at the bottom.
They're usually 1.5" tapering to 1 1/8" so no, you can't use a tapered steerer fork in a standard 1 1/8 frame.
However you can get adapters and special headsets that allow you to use 1 1/8" forks in a frame with a 1.5" or tapered headtube.
@Pir0 started
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They're stiffer where they need to be stiffer, at the crown race where the fork meets the headtube at the bottom.
They're usually 1.5" tapering to 1 1/8" so no, you can't use a tapered steerer fork in a standard 1 1/8 frame.
However you can get adapters and special headsets that allow you to use 1 1/8" forks in a frame with a 1.5" or tapered headtube.