Actually contact patch or (Talla) as locally called of suggled tyres especially soft tyres like continental , yokos etc gets distorted in shape due to rough handling and tashudud on tyre during smuggling.
These undulations on tyres are not even balanced by out local balancing machines they need special balancing called ( Road Force balancing) you can know more about this on YouTube.
Thus these minor bumps are not road bumps but are due to tyres.
Also althouh you get your tyres balanced by best balancing technician and machine .
Still your smuggled tyre will vibrate at different speeds(means at some speed vibration disappear and occurs again at other speed.
Happend with me when i got my brand new Yaris Ative tyres changed with smuggled ContiCc6 my car vibrates although after doing balancing . My car vibrates at 40-50km/h vibration feels like road is imbalance or bumpy while my other cars run smooth on that road. Then after 50 vibration disappears and occurs again above 130km/h and above.
Then i changes my Yaris tyres with Yokohoma advan db v552 imported by sheikh brothers. Official importer.
And my car becomes buttery smooth and all vibrations disappear.
Also our local technitions dont know that new tyres have red and yellow mark on their side wall and you have to allign that Red mark with tyre nossel
Or Some Bigger rims have a dotted mark on them .
If they have that mark then Allign that red dot with that mark.