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Safety is a matter of concern for people who carry loads in their trucks. While even the soft covers come in thick materials that are not easily torn, you should opt for hinged covers in materials like fiber-glass and aluminum if you want complete safety. These offer the utmost protection when locked.

Larger and more rugged dump trailers cost $5,000-$15,000, depending on size, number of axles, type of hydraulic lift, weight capacity and whether it's a standard bumper pull or gooseneck hitch (which extends forward and connects to a ball installed in the bed of a pickup truck).

On a wagon or chariot, the wheels just respond and have to roll. On a bicycle or motorcycle, the power from the rider or engine is transmitted to the hub, forcing the hub to rotate. The spokes then need to transfer that power to the rim to make the wheel spin.

The crankset, rear cassette, chain and derailleurs are known collectively as the drivetrain, pictured here: Chain rings: Bikes have one, two or three front chain rings, also known as the crankset. A bike with two chain rings is called a double. A bike with three chain rings is called a triple.

A bicycle frame is the main component of a bicycle, onto which wheels and other components are fitted. The modern and most common frame design for an upright bicycle is based on the safety bicycle, and consists of two triangles: a main triangle and a paired rear triangle. This is known as the diamond frame.

Begin by counting the number of teeth on the largest front sprocket and largest rear. These numbers are often printed right on the sprockets and cogs. Next, measure the distance between the middle of the crank bolt to the rear axle. This is also the chain stay length.