Is it permitted for a motorcycle owner to replace the motorcycle’s original-size tires with tires of a different size?

1. Yes, but only on motorcycles with a sidecar.
2. Correct answer: No, unless he obtains a pre-approval to do so from the Licensing Authority.
3. Yes, provided that the new size deviates within 10% of the size indicated in the vehicle’s registration document.
4. Yes, he may save fuel that way.

WhyTires of a different size may be fitted only with prior approval from the Licensing Authority. There is no 'plus or minus 10%'.