Motorcycles and Choppers

The Motorcycles and Choppers Channel explores how these machines are built and customized. Learn all about motorcycles and choppers at HowStuffWorks.

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The 1938 Harley-Davidson UL motorcycle featured a Flathead V-twin instead of the newer Knucklehead. It was a Sport Solo model with new colors and striping available. See pictures and learn about the Harley UL.

By the Auto Editors of Consumer Guide

The 1942 Harley-Davidson WLA motorcycle and Harley-Davidson XA motorcycle were weapons of World War II. Wearing the requisite Olive Drab paint, these were 45-cubic-inch V-twins fitted with special wartime equipment. Learn about these Harleys.

By the Auto Editors of Consumer Guide

The 1948 Harley-Davidson FL motorcycle introduced Harley's overhead-valve Panhead engine. More chrome trim pieces gave the bikes a fancier look and a steering-head lock was added. See pictures and learn about the Harley FL motorcycle.

By the Auto Editors of Consumer Guide

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The Harley-Davidson S-125 motorcycle was a popular civilian bike in the wake of World War II. Producing only three horsepower, the S-125 had a tough time reaching 55 miles per hour. See pictures and learn more about the Harley S-125.

By the Auto Editors of Consumer Guide

The 1948 Harley-Davidson WL motorcycle was one of the last Harleys with a small V-twin. It proved to be a versatile engine that remained in production for more than four decades. See pictures and learn more about the 1948 Harley-Davidson WL.

By the Auto Editors of Consumer Guide

The 1920 Ace motorcycle had a short life, but it was a powerful and durable bike. Production ceased in 1922 due to financial setbacks and the death of its creator in a motorcycle accident. Learn about the 1920 Ace.

By the Auto Editors of Consumer Guide

The 1970 BSA Lightning motorcycle battled faster less-expensive Japanese bikes. BSA didn't survive long afterward as the competition from Japan proved too much. See pictures and learn how the BSA Lightning dealt with its rivals.

By the Auto Editors of Consumer Guide

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The Vespa is a two-wheeled scooter used for easy transportation and loved for high-fashion style. Learn how they're made, the history behind it and the style that has made it so popular.

By Ed Grabianowski

Wouldn't it be great if one vehicle could handle snow, mud, and regular road conditions without having to even change tires? Enter the Hyanide a vehicle designed by students for the 2006 Michelin Challenge.

By Ed Grabianowski

Motorcycles, which can achieve fuel economies as high as 85 miles per gallon, provide an attractive alternative to gas-guzzling cars. Learn how motorcycle design has evolved over the years.

By William Harris

It could be the distinctive body styling, or maybe it's that tellatale sound. There's just something about Harley-Davidson motorcycles that hundreds of thousands of folks can't resist. Find out all about this motorcycle icon.

By Marshall Brain

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There is no denying that a Harley-Davidson motorcycle has a unique sound. So makes a Harley sound different from other motorcycles?