Real trikes are usually custom made, often involving using a car engine as the power source. A popular engine that is used is one taken from a Volkswagen Beetle. Such an engine will give a three wheeled vehicle just the right amount of acceleration and speed.
There's a whole culture that goes with riding these machines too. That culture places trike owners in the same bracket as motorcycle owners, distinct from those of us who drive cars and other four wheeled vehicles.
Human-powered trikes are usually powered by pedals, although some models have hand cranks. Motorized trikes can be powered with a variety of methods, including motorcycle engines, smaller automatic transmission scooter motors, and electric motors. The term "tricycle" may or may not include motorized Three Wheeled Cars, depending on local lanscape.
Children's trikes are made of steel frames or plastic. One disadvantage of plastic frames is that they be more likely to tip over than a steel frame if a heavier child is riding. On the plus side, plastic frames will not rust like steel frames if the trike is left out in the rain. A good quality trike's wheels will have treads, which provide better traction.
In the case of delta tricycles, the drive is often to just one of the rear wheels, though in some cases both wheels are driven through a differential. A double freewheel, preferably using no-backlash roller clutches, is considered superior. A jackshaft drive permits either single or two-wheel drive. Tadpoles generally use a bicycle's rear wheel drive and for that reason are usually lighter, cheaper and easier to replace and repair.
Trikes' strongest suits are cornering, stability, comfort, rider stamina and terminal velocity. Trikes can be used by adults who have problems riding bicyles. As well, trikes are a good choice for elderly riders who are worried about falls. Trikes can ride and climb at very low speed and a kickstand is never needed.
Urban delivery trikes are designed and constructed for transporting large loads. These trikes include a cargo area consisting of a steel tube carrier, an open or enclosed box, a flat platform, or a large, heavy-duty wire basket. These are usually mounted over one or both wheels, low behind the front wheel, or between parallel wheels at either the front or rear of the vehicle, to keep the center of gravity low. The frame and drivetrain must be constructed to handle loads several times that of an ordinary bicycle; as such, extra low gears may may added. Other specific design considerations include operator visibility and load suspension. Many, but not all, cycles used for the purpose of vending goods such as ice cream cart trikes or hot dog vending trikes are cargo bicycles.
Spidertrike is a recumbent cycle rickshaw that is used in central London and is operated by Eco Chariots. It is a front wheel drive tricycle, articulated behind the driver seat. The passenger is protected from rain and sun with a canopy. These pedicabs have features like double disc, hydraulic disc brakes and internal hub gears.
Makers of recumbent trikes include KMX; Hase (who make the Kettwiesel delta, improbably named after the British children's programme Catweazle); Inspired Cycle Engineering, who make the Trice range of tadpole trikes; AVD, who build the record holding Burrows Windcheetah or Speedy, a design exhibited in the Metropolitan Museum of Modern Art (MoMA); Australia's Greenspeed, one of the oldest manufacturers; Michigan-based WhizWheelz, which makes 10 models, including a sub-US$1000 model tadpole and a tandem; and Big Cat HPV which builds the 6 Catrike models in Florida.
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