Hi, i wanted to ask, few month ago i bought 2 Michelin PS3 for me ecobox, after few weeks, i realized that that 2 tyre is relatively not even, so need to put extra balancing when balancing the tyre, however i doesn't help much on high speed, it will vibrate quite badly.

Is this type of defect common? or that seller is selling defect/rejected tyre from factory?

yes, i brought my car to certified/professional suspension tuner, he tested it and show what the tyre problem, when u do balancing(put tyre on the rotate mechine thingy) can see tyre is a bit uneven.. quite sad since i realize it tad a bit late.

yup, it doesn't happen with my previous Kumho PS31, only after i changed to Michelin PS3..