Is the owner of a motorcycle permitted to fit tyres of different dimensions in place of the original tyres?

1. APermitted, but the difference must be no more than ten percent of the size recorded in the vehicle licence – either way.
2. BPermitted. It can save him fuel.
3. CNot permitted, unless he has received prior approval for it from the Licensing Authority.
4. DPermitted – but only the owner of a three-wheeled motorcycle and the owner of a motorcycle with a sidecar.

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