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What is the legal size requirement for a motorcycle?
Stu
From the "Ask Jack" archives - 24 August 2009
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A motorcycle is a vehicle with an engine capacity over 50cc, has a power output greater than two kilowatts or has a top speed greater than 50 km/h.
A bike which is under 50cc, power output of less than two kilowatts and has a top speed less than 50 km/h is classed and registered as a moped.