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However, those magnesium wheels proved to be impractical because they were prone to corrosion and they were mostly used in racing sports. After 1960's magnesium wheels were gradually replaced by aluminium alloy wheels on the mass market, but not from the competition wheels market. Many manufacturers of magnesium wheels are still operating.
Wheels with Asanti 28 in (710 mm) rims on a police Hummer H2 car. The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces.
The rim type codes SS or HB precede the rim designation, whereas code C is appended to the nominal width. Examples: SS 400×20, HB 422×25, 620×13C. The nominal width of a rim is the inner width between the straight sides or beads as one can easily measure it with a caliper (see the standard for drawings and exact measurement procedures).
Alloy wheels have long been included as standard equipment on higher-priced luxury or sports cars, with larger-sized or "exclusive" alloy wheels being options. The high cost of alloy wheels makes them attractive to thieves; to counter this, automakers and dealers often use locking lug nuts or bolts which require a special key to remove.
ETRTO sizes apply to rims and tyres for vehicles of all types, including bicycles. The great advantage of ETRTO sizing is that it is unambiguous; previously, nominal dimensions were used which were interpreted in different ways by different countries and manufacturers - a problem for the end user.
Marking AZ91A for example conveys magnesium alloy with roughly 9 weight percent aluminium (between 8.6 and 9.4) and 1 weight percent zinc (between 0.6 and 1.4), and the final A means it was the first alloy with this composition at the time of registration. Exact composition should be confirmed from reference standards.