I just got a set of Volk GT-C rims...19's...mounted on my Z...they look pretty sick! The only problem is that around 100 miles per hour I get vibration from my wheels. Is this an alignment problem or do my wheels need to be balanced? HELP!

 

Sounds like a sloppy balance job to me. Swap them front to back (if possible) and run'er up again. If the vibration is gone or different, take them back for a rebalance.

 

I can't swap them...19 X 8.5 in front and 19 X 9.5 in the back...thanks for the advice

 

dejavu?

 

You should check to make sure that hub centering rings are installed on each wheel.

 

balancing problem or no hub-centric rings installed. easy fix. Just go to a reputable tire shop.