Most trailers have a separate axle for each wheel, like those used on a bicycle. This hazard can be diminished if a braking system is added to the trailer, typically some form of overrun or inertial braking system. The heavier the load, the more hazardous the ride becomes due to the inability to stop the trailer from continuing to move forward into the cyclist. On the other hand, the European EN 15918 standard for the maximum load is 60 kg (132 lb). According to the American ASTM F1975-15 standard, a limit of 45.4 kg (100 lb) can be carried in a trailer without brakes.Trailers with brakes (often referred to as braking trailers) allow heavier loads to be safely towed. Heavier loads on trailers increase the safety risks.Examples are Aevon Trailers (Cycloboost), Ridekick International (Ridekick), Topeak (Journey Trailer), etc. Electric bike trailers are trailer with electric propulsion.Pet trailers: For carrying small domestic animals, especially dogs, that weigh less than 45 kg (100 lb).Disabled passengers: Made for safely towing wheelchairs with persons in them.Canoe and kayak trailers: Designed for towing long, thin and relatively lightweight loads such as canoes, kayaks or windsurfing rigs. ![]() These trailers are by far the most popular style. ![]() These allow small children who can't yet ride a bicycle alone to accompany adult riders as trip participants and motive-power producers. Child passenger (as rider): Trailer bikes, or pedal trailers, are one-wheeled trailers (tandem trailers) with integrated seat, handle bars, and drive train, that normally attaches to the bike via the seat post (and operate very much like a tandem).Trailers have also been used as pedicabs. A lot of the trailers designed for transporting children can also be converted to strollers. These usually have a low centre of gravity and widely spaced wheels to increase stability when cornering, and often have integrated rain-proof covers, seat padding, and safety belts. Human passenger (as cargo): constructed to enhance the comfort and safety of one or more human passengers.The load capacity of commercially available cargo trailers ranges from 14 to 140 kg (30 to 300 pounds), but much larger loads have been transported by custom-built trailers or by multi-trailer "trains" attached to a single bicycle. General cargo: for transporting cargo of all kinds.This trailer is usually connected via a fork-mounted tow bar and allows for the greatest weight capacity out of all types of bicycle trailers, in some instances even equipped with its own overrun brakes and electric motor assist. Three-wheel: Similar to two-wheel trailers with wheels on either side of the cargo area, but also equipped with a fork-mounted front wheel to remove practically all tongue weight from the lead vehicle. ![]() Two-wheel trailers tend to be as wide or wider than the handlebars of the bicycle, therefore care needs to be taken when riding through narrow spaces. Though not suitable for high speed, they are ideal for everyday cycling (very much like towing a trailer behind a car).
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