Before you say it's a cheap bike, what more do you want... I get that! :D
But it's brand new, and as you pedal it... no matter the speed, you get a pop sound at a specific point on each rotation...

What could / should I do to help silence this sound and make the ride more enjoyable.

Please advise if you can!

VIDEO UPDATE:
I uploaded this video of the happenings ;)


                
            


Question: Adding parent_id attribute value in model
Answer: You might also want to try 
$model-&gt;setData('parent_id', $value);
and as a personal opinion i would double/triple check you are saving the object correctly.