Join Date: Dec 2006
Location: Severna Park, MD
I would revisit the balance of the front tires and wheels by having them "road force balanced". I had a balance issue for years until I heard of this procedure. It's a matter of comparing the balance characteristics of the rim with those of it's mounted tire. Once the OOB (out-of-balance) is determined, the tire is rotated on the rim to achieve the lowest OOB. Each combo is given a score with the lowest number being the least OOB.
Therefore, one combo may receive a score of 10, with the others being, 15, 25, and 30.
In my case, I had one rim from new (20 years old) the worst of the bunch and happened to be mounted up front (left). After having all 4 combinations Road Force balanced, I place the least two (based on lowest out-of-balance score) mounted up front. The remaining two went on the rear with each mounted to counter-balance their diagonal counter-part in front. Using the examples above. 10 and 15 would go up front. #10 on the left and #15 on the right. #30 would be mounted right rear to counter #10 and #25 on the left rear to counter #15. At least, this was my reasoning and it seems to have worked.
This sounds confusing I can imagine, but, once figured it out, the worst of my vibrations went away. If I were buying new rims today, I would have each checked for runout and balance before mounting tires. And we all know tires are not perfect, as well.
Hope my experience works for you. BTW, not all shops are familiar with Road Force balancing, so check around. May cost more, but, I was so grateful.
64 1/2 Poppy Red Cvt. Resto-Mod
333 Cu.in. T5z, 3:55, Dual 40 mm DCOE Webers
Performer RPM, CI cam, TFS/TWs, Tri-Ys, Discs w/Shelby Drums
Severna Park, Maryland