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TR6 Shimmy at certain speeds

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Hey, As I am writing this, I have a possible answer: drive shaft/u-joints. I recently had new Coker redlines put on the '72 TR6. I painted the wheels while I had the chance, then had the tires, with innertubes mounted and balanced, and an alignment done. As im driving, I notice a shaking or shimmy occurring at 45 and 60 mph. I took it back to have the balance checked, and it is just fine. They did drive it and they thought it might be a bad shock. Or as I mentioned above, a bad u-joint? Any other ideas?
 

TR3driver

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Could be almost anything that rotates but isn't part of the balancing process. My biggest problem turned out to be new brake rotors that were off balance; but I also discovered several front hubs that didn't run true.

"Back when" you could find shops that would balance the tires on the car (for an extra charge). But it's been a long time since I've found one that has the equipment. I finally bought one myself.
 
OP
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I did not notice it with the old tires . . . maybe I need a different garage to do the balancing? These guys are older gents, 50+, that seem to know what they are doing, well experienced, but . . .
 

Telly

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Ouch,
Coker tires seem to get a lot of negative press lately. Don't rule out bad tires just because they are new/newer.

Put cheap tires (made somewhere in Asia) from Firestone on my TR4 and they developed flat spots after 6 months, which of course created a shimmy...had them replaced and problem solved.
 

tinman58

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I am leaning towards the cooker tires as the problem. I had the same thing happen after the restoration of my 250. New cooker tires on good rims. I would get a shimmy at certain speeds. Had the tires rebalanced. Still had the shimmy. At that point I was thinking that it was something else. So I put the rims and tires on from my TR3 with the panasport rims and the 250 ran nice and smooth. No shimmy. In the mean time I got a good deal on wire wheels and tires. That is what I have ben running ever since. I have heard that the tire it self can be balanced. I would like to use the redline tires on my 250 because they look great. But haven't done so because of the shimmy.
 

Jim_Stevens

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I would send them to Hendrix Wire Wheels in NC for their micro balancing. Worked for me— no more shimmering at 60...
 

seadiver

Freshman Member
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Call your local tire stores and ask if they have a Hunter Road Force diagnostic machine. Might rule out the Cokers as the culprit.
 
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