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a tandem
you could call it a tandem or a daisy bell bike
Normally, two. There are usually only two seats on a tandem bike.
Tandem means that first you hook the power sources to each other, then to whatever it is that's being powered - like the stoker and the captain on a tandem bike
A tandem bicycle.
Tandem bicycles are bike designed for more than one rider. Brands that offer tandem bikes are Co-Motion cycles, KHS Bicycles, Santana Tandems and Trek Bikes.
The first mountain bike is build in 1966 in the United Kingdom.
That's like asking how safe are minivans. A well built, well maintained and sensibly used tandem bike don't come with any special risks. Ride it like a fool, ignore the upkeep, and a tandem - just like any vehicle - can bea death trap.
1958
Bike rider, randonneur.
You're probably thinking of a tandem
The one who works the hardest.