Aluminum and magnesium are two metals commonly used in the production of vehicle rims. These metals are abundant in nature, and have similar properties that are used to create efficient and visually appealing rims. Aluminum and magnesium rims are lightweight and increase gas mileage, but they have important differences when it comes to durability and price.
Magnesium rims are generally a few pounds lighter than aluminum depending on rim size, therefore magnesium rims are preferred for vehicles built for racing. They lighten the vehicle, which increases overall acceleration and leads to better gas mileage. Wheel balancing isn't needed as much with magnesium rims. Handling, steering and braking is more responsive, especially if magnesium rims are paired with low-profile tires.
Magnesium rims will ignite if exposed to the extreme temperatures of a vehicle fire. Magnesium burns very hot, and a magnesium fire cannot be extinguished using water. Aluminum has a low melting point, will not ignite like magnesium and cools quickly.
Aluminum rims can bend when encountering a large pothole, which allows the driver to maintain control of the vehicle. Magnesium rims, however, can crack and fail -- leading to failure of the entire wheel. Such a failure can cause the driver to lose control of the vehicle. Magnesium rims need to be replaced more often than aluminum, but durability will degrade less with regular maintenance.
Magnesium rims require much more maintenance than aluminum. Aluminum rims will not rust and can be cleaned easily. Many auto stores sell products to buff and clean aluminum rims. Magnesium rims need to be sealed and painted. Any cracks or chips need to be protected against air exposure. Air exposure will cause the bare metal to become pitted and weak. Repairing rim damage on a regular basis is considered too much work for most drivers.
Magnesium rims, which are usually aftermarket products, are among the most expensive on the market. Aluminum or steel rims are standard on most all vehicles. From a cosmetic standpoint, aluminum rims can appear identical to more-expensive magnesium rims. Due to the price difference and factory standards, more drivers use aluminum or steel.
- Photo Credit Wheel of motorcycle image by AlKulon from Fotolia.com
What Is the Difference Between Magnesium Glycinate and Magnesium Gluconate?
Magnesium glycinate and magnesium gluconate are magnesium salts of an organic acid and magnesium. Both can be used to provide magnesium in...
What Are Aluminum Alloy Wheels?
Aluminum alloy wheels are used on many cars and trucks as OEM (original equipment manufacturer) equipment as well as after-market upgrades. Alloy...
What Is the Difference Between 14 and 15 Inch Rims?
Rims come in multiple sizes, usually expressed by their diameter. Two of the available sizes are for wheels that are 14 inches...
What Is the Difference Between Alloy Wheels & Premium Wheels?
Steel wheels are the standard sold on high volume car models. However, manufacturers often offer upgrades to alloy or premium wheels, that...
How to Select Wheel Rims
For some drivers, the biggest concern with their car's tire rims (or wheels) is appearance. But an owner's choice of rims really...
How to Clean Aluminum MAG Wheels
Keep your car looking it's best when you maintain your Aluminum MAG wheels. The wheels on your car are constantly exposed to...
How to Clean Magnesium Wheels
Magnesium (mag) wheels are more expensive than steel wheels because of their light weight, precise steering capability, better acceleration and greater breaking...
How to Tell the Difference Between Polished & Anodized Aluminum
Anodized aluminum is pure metal that has been altered by chemicals and an electrical current. This process causes a controlled oxidation that...
How do I Tell the Difference Between Refrigeration and Type L Copper Tubing?
Identifying the difference between Type L copper tubing and the copper product used for refrigeration can be somewhat tricky because both are...
How to Tell Magnesium Rims
Magnesium rims are hallowed as the classic American racing wheel. Mag wheels on the street evoke the speed, grace, and excitement of...
The Difference Between a Billet & a Cast Aluminum Rim
Anyone who has ever considered replacing his original-equipment wheels with aftermarket aluminum rims has noticed the large price differential between cast and...