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Thread: Shimmy at certain speeds

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    Shimmy at certain speeds

    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?

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    Great Pumpkin NutmegCT's Avatar
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    Re: Shimmy at certain speeds

    Did the shimmy problem exist before you put on the new tires?

    Tom M.
    Mac & Phyllis Take a Trip: http://nutmegflyer.com/trip-details-daily-updates/
    History: 1976 MGB, 1959 Triumph TR3A, 1960 Mercedes-Benz 190b, 1958 Rambler American.
    Current: 1953 MG TD27318.

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    Great Pumpkin TR3driver's Avatar
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    Re: Shimmy at certain speeds

    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.
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
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    Re: Shimmy at certain speeds

    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 . . .

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    Re: Shimmy at certain speeds

    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.
    72 TR6 and 64 TR4

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    Re: Shimmy at certain speeds

    Well, maybe I just wont drive at those speeds. Who wants to go so slow anyway!

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    Re: Shimmy at certain speeds

    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.
    Dan
    TS37148L Restored and running! Again!
    TS23575L gone, but found in a wharehouse
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    TR 250 CD835LO

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    Re: Shimmy at certain speeds

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

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    Re: Shimmy at certain speeds

    Call your local tire stores and ask if they have a Hunter Road Force diagnostic machine. Might rule out the Cokers as the culprit.
    A seadiver lost in space
    1971 TR6
    1973 TR6
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