Australian Design Rules (ADRs) limit frame modifications and fork extensions to 6 inches (150 mm). The most restrictive rule allows a maximum distance of 550 mm from the front axle horizontally back to the steering head. Noise restrictions and handlebar dimensions are also regulated. However, in some states ADRs do not apply to pre-1977 motorcycles, so some older, more radical choppers are still seen on Australian roads.
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