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John tumbled off a bicycle. OK
John tumbled down a bicycle. NO
John tumbled down from a bicycle. IFFY. Maybe used more for a long tumble.
John tumbled out of a bicycle. NO. "Out of an enclosed space like a car is OK.
John tumbled over a bicycle. OK
Do all of the above sound right and mean about the same? If not, why not? Thanks.
Thanks, riverkid.
Got it except for "John tumbled down from a bicycle." IFFY. Maybe used more for a long tumble.
Does the underlined part mean it's all right to write "John tumbled down from a flight of stairs?" If yes, then is it identical to "John tumbled down a flight of stairs?"
John tumbled off a bicycle. 
Re: John tumbled off a bicycle. 
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