I run 525 x 16 Coker/Firestone bias ply tires on the front of my 5-window and 700 x 16's on the rear. I like the look but have been having trouble from keeping the front from bouncing all over the place. They balanced out OK but over 55 mph it wanted to shake you silly. One tire was worse than the other so I called Coker, expalined the situation and ordered a replacement. I received the new tire and sent the old one back. Once I mounted the new tire I found that it was as bad or worse than the first. I had previously checked the runout on my wheels and they were both decent. I had a couple other wheels that had been trued up for another project by my local wheel shop so I mounted the new tire on one of them to see if any difference. The side wall wobbled all over the place and it shook badly after balancing. I called Coker and order another new one and once I received it sent the original replacement back again. The new new tire that I received was much better but I took both tires and had them trued and re-balanced and all is well. Today I got a call from Coker and they said that they found nothing wrong with the tire and they were shipping it back to me and my expense. I realize that messing with bias ply tires is not the smartest idea but has anyone else had the same problem?