Question: what size engine bike can i ride at 21?
Answer: A1 licence (allowing you to ride a 125cc bike) if you are 17 or over. A2 licence (limiting you to a maximum bhp of 47) if you are 19 and over. A licence (allowing you to ride any bike of any sized engine) if you are 21 and have held your A2 licence for two years or more.