Eurotech Wheel Balance

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Hello to all,
I recently purchased a set of 4.8is Replica's from Eurotech for use as my winter setup on my 03 4.6is. The tireshop has rebalanced my wheels twice due to a vibration from the rear but has not been able to get rid for the vibration. Has anyone else had an issue balancing these wheels? Should I return them to Eurotech? They look great and Eurotech seems to have a very good rep here on the board, but am concerned they might have a manufacturing flaw. I have purchased a number of tires from this shop with no balancing isses in the past.


Any help appreciated,

jg