Frequency of wheel balancing – It is recommended to a wheel balancing every 20,000 KMs to 30,000 KMs. Usually u will have unwanted vibrations to indicate that balancing is due.
It is to be understood that wheels and tires usually are not perfectly round, even when brand new. and their weight often isn't evenly distributed, so they're heavier in some spots than others. Either issue can cause annoying vibrations. Out-of-balance tires can also cause rapid tire or suspension wear, so it's not just about ride comfort.