Road force measurement balancing

[MaSnaka]

I had similar shaking in the car at 30-35 and then again at 60-70 mph. After Hunter Roadforce balancing several times, adjusting air pressure, alignment, I even had the tires balanced while mounted on the car (now there is a lost art). Nothing seemd to eliminate it to an acceptable level although it would seem to improve slightly. All the tire guys kept saying "get rid of the bias-ply tires". I started thinking all kinds of mechanical things were to blame and disliked driving my car so much it sat. I finally replaced the tires with new radials and woah that made all the difference. It was like driving a different car. I can's say for sure but that might be all you need to do.

[tamanaco]

Originally Posted by MaSnaka

I had similar shaking in the car at 30-35 and then again at 60-70 mph. After Hunter Roadforce balancing several times, adjusting air pressure, alignment, I even had the tires balanced while mounted on the car (now there is a lost art). Nothing seemd to eliminate it to an acceptable level although it would seem to improve slightly. All the tire guys kept saying "get rid of the bias-ply tires". I started thinking all kinds of mechanical things were to blame and disliked driving my car so much it sat. I finally replaced the tires with new radials and woah that made all the difference. It was like driving a different car. I can's say for sure but that might be all you need to do.

Thanks for the feedback. My car tires are radials. 235 60 15's started with BFG (9K miles), then INDY 500 Firestones (50 miles), and how Cooper Cobra. I my viewing of the 6 tires the Cooper Cobra have been the best. This is based looking at the tires spinning on the balancer, roundness and tread side to side movement the Coopers handsdown the best. I do want to say it's only been two of each tires.