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A 1977 Harley-Davidson XLCR with seven-spoke alloy wheels manufactured by Morris [8]. High-performance motorcycles began to use cast alloy wheels (usually aluminum but sometimes magnesium) as early as the Münch Mammoth, with its single cast-elektron [9] rear wheel which was shown at the Intermot motorcycle show at Cologne in late 1966. [10]
What metal the spokes were made from depended on the model of motorcycle. The CB400T, for example, used steel for the spokes and alloy for the rim, whilst the CBX and the Super Dream used alloy for both the spokes and rims to further reduce unsprung mass. For the NR500, the wheels were made from magnesium, with titanium used for the fasteners ...
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.
The GN400 was based on the SP400 Enduro motorcycle and was also available as the GN400X, which substituted spoke wheels for the GN400's alloy wheels, as well as having a flatter seat and flatter, shorter handlebars. Neither GN400 had an electric starter.
For a normal wheel size and spoke count, only the latter is suitable for a wheel that has to transmit torque from the hub to the rim, as with rear wheels or hub brakes. This rule is occasionally broken where a very large number of spokes is used, or the wheel is unusually small in diameter, either of which reduces the amount of increased ...
The wheel rims are usually steel or aluminum (generally with steel spokes and an aluminum hub) or mag-type cast or machined aluminum. Cast magnesium disks, produced by one-step hot forging from magnesium alloys ZK60 and MA-14, are also used for many motorcycle wheels.