Aftermarket wheels

i HAVE A SET OF AFTER MARGET M5 WHEELS THAT THE PREVIOUS OWNER THEW IN ON THE DEAL, WHEN THEY WERE MOUNTED ON THE CAR, I GOT A SHIMMY AT 50MPH, NOW THAT THE FACTORY WHEELS ARE BACK ON, EVERYTHING IS FINE, I REALLY LIKE THE M5 WHEELS, THEY WERE ON CHEAP TIRES, IF I GET GOOD TIRES, DO YOU THINK THEY WILL BE GOOD

The shimmy might be fixed with good tires but most likely it is the balancing. When I swapped out to miro m6 aftermarket wheels, the dealer tried to balance but couldn't get rid of highway speed shimmy. The aftermarket wheels were not hub centric which means the axle size was a couple millimeters bigger, which is ok but much harder to valance b/c the normal tire balancing machine off the car can show perfect balance but the slightest failure to center the wheel on the axle can cause the shimmy.
My advice is to find a good higher end performance tire/wheel shop that does "on car" high speed balancing (I use Butler tire here in Atlanta). The gave done a great perfect job balancing the last two sets of tires for me on my non hub centric aftermarket wheels. Good luck.

Wheel size was a couple millimeters bigger than the axle (not the other way around ...

Originally Posted by gregb

Wheel size was a couple millimeters bigger than the axle (not the other way around ...

I would install centering rings on your wheels. They make rings that press into the wheel to make them hubcentric. It's almost impossible to get wheels vibration free at speed if the wheel is not hubcentric.

Any good wheel shop should be able to order the rings for you. They are not expensive.

Originally Posted by jcskijeff

i HAVE A SET OF AFTER MARGET M5 WHEELS THAT THE PREVIOUS OWNER THEW IN ON THE DEAL, WHEN THEY WERE MOUNTED ON THE CAR, I GOT A SHIMMY AT 50MPH, NOW THAT THE FACTORY WHEELS ARE BACK ON, EVERYTHING IS FINE, I REALLY LIKE THE M5 WHEELS, THEY WERE ON CHEAP TIRES, IF I GET GOOD TIRES, DO YOU THINK THEY WILL BE GOOD

Find a shop that can do wheel balancing while the wheels are still on the car or a shop with a Hunter RoadForce balancer. That should help determine if it's the tire or wheel issue.

Originally Posted by Yorgi

I would install centering rings on your wheels. They make rings that press into the wheel to make them hubcentric. It's almost impossible to get wheels vibration free at speed if the wheel is not hubcentric.

Any good wheel shop should be able to order the rings for you. They are not expensive.

Yeah - they did put on the hub-centric rings and did the on car high speed balancing. Forgot to mention the rings in my post. Thanks.