you can tell easaily as decent make will have name around edge of brgexcellent..well I decided to dismantle one bearing. thin flimsy plastic seal was covering bearing race, this seal had let in sand/dust and making it noisy I believe. I'm sure the more expensive bearings are double sealed which leads me to believe I had **** ones on mine.
I'll check new ones out on Monday hopefully!
great, informative post with vids!
I have a horrible whining grumble from the rear of mine.......and a clonk when pulling away.....could my issue be similar to yours?
I am trying to self diagnose to save cash.......