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There are double strollers and trailers for bicyclists. A bicycle can be hooked to a double stroller so a person can take children on bike rides. Also, there are trailers that can hook to the back of a bike as well.
The person who rides on the back of a bike is a passenger.
Travis Pastrana
no
first in competition was travis pastrana in x games best trick there may be others that have attempted before, however in terms of competitive recorded double back that would be travis
250 2 stroke
4 people
no
The first double backflip ever landed was made by travis pastrana in 2007
travis pastrana of course! he was the first person to do a double backflip!
troy sircombe
Alienation Black Sheep Double Wall Rims, front and back