The Complete Handbook of Bicycle Trailers

Chapter 1: Understanding Bicycle Trailers

From moving tools to a job site in a dense city to hauling two children to school on a suburban bike path, a bicycle trailer converts pedal power into practical cargo capacity. It is a deceptively simple but mechanically profound device: a wheeled chassis that connects to a bicycle at a specific pivot point, allowing the towed load to vastly increase the bicycle's carrying capacity without adding weight to the bicycle's own frame.

At its core, a bicycle trailer is a separate vehicle designed to be towed. This distinction is critical. Everything about its design—from the wheel diameter to the hitch mechanism to the laws governing where it can be ridden—is conditioned by its status as a towed vehicle. Consider the alternatives: a large basket attached to a rack carries weight high above the rear wheel, dramatically shifting the center of gravity and destabilizing the bicycle, while heavy panniers strain the spokes and frame dropouts. A trailer, by contrast, carries its load low and between its own wheels, placing the weight on an independent axle. The bicycle's rear wheel becomes less a load-bearing component and more a steering element, as the trailer's wheels handle the bulk of the cargo's mass.

This fundamental separation of loads creates the primary advantage of trailer use: astonishing payload capability. A purpose-built cargo trailer, such as those used by bike delivery services, can legally and safely carry up to 200 to 300 pounds of freight. A typical touring trailer hauls