front end vibration

[John Poling]

Originally posted by C-man610




I would suggest going to a tire or alignment house that uses Hunter Engineering GSP 9700 Road Force Balancing equipment. Accept no substitute!!!!!!!!!!!

Happy days

I found a local shop that had the Hunter as described above and it was amazing to see the results. One of my front wheel/tires checked out to be balanced correctly on this machine but when they performed the "Road Course" test on the machine it found that the tire had a "harder" spot in one area that when driving on the road would be similar to a 25 pound weight on one area of the wheel. Keep in mind that it was balanced a was okay in a normal spin-up. My major vibration used to start at around 35-40 mph and didn't stop to at least 95 (that's all the higher I felt like going with the extreme vibration.

After the rework with the Hunter 9700 machine the major vibes were gone and now I am experiencing the minor vibes in the 58-70 mph range and they are mostly gone at 105-110 mph. I performed a runout test on the surface of the rotor that my wheel bolts to and found between .004" and .007" on all four front rotors that I have. I think the next step is taking two of them to a machine shop and have these faces trued to the C/L axis of the rotor and see what that does. The next step is to install a "rag" joint if the machining doesn't fix it. I have a real problem shaving a set of Michelin Pilots. That would be a last resort.

John