Forgive me if this post is long. First off, the above post about Discount Tire is correct.
Second, if anyone ever has a problem with
wheel balance (rough ride on smooth road) and the wheels/tires show that the balance is perfect, go to a tire shop that has the Hunter GSP9700 Road Force Balance Machine. (google both Road Force Balance Machine and/or Hunter GSP 9700 to get the information how it works.)
Here is my story. Last Summer, I purchased new tires for my Continental. I had a vibration around 55mph. Went back and had them rebalance. Still had the vibration. Went to a second place and had them rebalanced, (showed they were in perfect balance). They re-did it, and still had the vibration around 55mph. Next, I heard that my local Ford Dealer had a balance machine that would do everything but tell you your name. Went there, and found they had a Hunter GSP9700 machine. (So far, so good right, but read on). Had the Ford Dealer redo the balance, and the "Lazy Technician" says, "These tires are no good - take them back as they show too much Road Force" which read from 25 lbs to 43 lbs depending on the tire. Now I knew the tires were good but not knowing exactly how the Road Force Balance worked, I just accepted his word and paid them. WHAT HE ACTUALLY DID WAS TO TAKE A ROAD FORCE READING, BUT DID NOT DO THE CORRECTION. After reading about Road Force, and how to correct vibration, I went back to the Ford Dealer and asked why did he not to the correction. The answer I got was that "it would take too much time, and cost me too much". OK, I then telephoned my favorate tire dealer, Dunn Tire up in Rochester NY, as I was going there a couple weeks later. They told me that yes, one of their locations had the Hunter GSP9700 and they would do the job for $72.00 on all four wheels. When I drove up, I went directly there, and they did the job correctly. Here is what they did.
1. Placed tire/
wheel on machine and the machine spins tire slowly, with an additional
wheel pushing (forcing) down on the tire. When
wheel stops, a lazer light shines down on the tire, and the tech marks the tire.
2. Spins the tire again slowly, with a bar against the side of the
rim. A lazer light shine down on the
rim and the tech marks the
rim.
3. Somewhere here, the machine tells the tech how much Road Force it measured. Anything over 18 lbs is too much, and some places want it below 12 lbs.
4. Next, the technician deflates the tire, breaks the tire bead, and lines up the two marks on the tire and
wheel, then reinflates the tire.
5. Tech then repeats steps 1 thru 3.
6. Tech then spins tire fast for a "regular
wheel balance'
Tech does this for all four tires. After all four tires are finished with the Road Force Balance, the machine then tells the tech where to place the
wheel. LF, RF, LR, or RR.
The whole job took just a little over an hour for all four tires/wheels. The Manager saw that I was Retired Navy, so he gave me a Military discount, and the whole job only cost me $60.00
The Road Force Balance worked GREAT. No more vibration, at any speed.
After my return, I went to the Ford Dealer to tell the Service Manager what a lousy job they did a couple weeks before. Well, to make things right, he did give me a free oil change.
Again, look up those two things in Google. You won't be sorry.