thanks for the info.will update you.e name='eatingupblacktop' post='324369' date='Aug 9 2008, 10:39 AM']This is an easy one since the problem disappears when you put on the stock set.
Here are some possibilities:
Manufacturing defect on either rims or tires
Tire tread off center
Tires out of round
Rims not true (even slightly off will affect your ride)
Rims over torqued
Tires not mounted properly on rims
Wheels not balanced
You may have to replace one or more items to get it smooth. Another possibility is that you hit a bad bump in the road sometime. Many rims are fragile and can sustain damage on bumps/holes/cracks that would not affect oem wheels. That's the risk you take in going aftermarket.