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What are Mag Wheels?

By Mike Howells
Updated May 23, 2024
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Mag wheels are a kind of automotive wheel constructed out of magnesium metal alloy. They are popular in racing applications due to their light weight, and their aesthetic qualities make them desirable as aftermarket equipment among car enthusiasts. They are generally recognizable by their symmetrical spokes and high shine.

A typical set of mag wheels can weigh significantly less than an aluminum or steel set. Strong, lightweight wheels are particularly important in racing due to the benefits offered by having a lower unsprung weight. Unsprung weight is the measure of a car's wheels, suspension, brakes, and associated parts — basically everything that is not supported by the suspension itself. A low unsprung weight offers better acceleration, braking, handling, and other driving characteristics. In addition, a lighter wheel will generally have better traction than a heavier wheel because it can respond more quickly to bumps and ruts on the driving surface.

These wheels are built using a one-step forging process, most commonly with the alloy known as AZ91. The "A" and "Z" in this code stand for aluminum and zinc, which are the primary metals in the alloy, aside from magnesium. Other metals commonly used in magnesium alloys include silicon, copper, and zirconium.

Mag wheels first rose to prominence during the American muscle car era of the 1960s. As enthusiasts strived for greater and more unique ways of making their vehicles stand out, aftermarket wheels became an obvious choice. Mags, with their high shine and racing heritage, were prized for their looks and performance. Due to their popularity, they prompted a large number of imitations and forgeries. Steel wheels coated in chrome could replicate the look, but not the strength and light weight of magnesium alloys.

For all their benefits, the main downside of mag wheels is their cost. A quality set can cost as much as double the price of a more conventional set. As a result, they are not commonly used for daily driving, and are not always offered as stock equipment on cars, though that can change among higher-end models. In professional racing, of course, cost is less of an issue compared to performance.

In addition, magnesium has a reputation as a highly flammable metal. With an ignition temperature of 1107°F (597°C), and a melting point of 1202°F (650°Celsius), however, magnesium alloy wheels are unlikely to pose any additional danger, in either normal driving or racing use. Magnesium fires have been known to occur with these products, however, and are usually difficult to extinguish.

WikiMotors is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.

Discussion Comments

By anon343605 — On Jul 31, 2013

Very informative. Thank you.

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