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I just found I have an issue with my 2015 Holden Colorado: at highway speeds between 100-120km/h it starts to vibrate, and you can feel it through the floor and slightly through steering wheel.
A wobble or vibration big enough to be felt through the floor that suddenly occurs for no reason, can often be traced back to a wheel balance issue. If the wobble is worst through the car's steering wheel, it's likely to be a front-wheel balance issue, otherwise we'd be looking at the rear wheels.
The generally terrible state of our roads at the moment is probable cause for this, and a decent impact with a pothole can be enough to dislodge the small weights on a car's wheel that make it balanced and, therefore, rotate smoothly. When you consider how fast a wheel is turning at 100km/h, you can imagine that a small imbalance can be enough to produce a big wobble.
The good news is that this is a simple fix. A visit to a tyre specialist will soon determine of a wheel balance problem is the issue and it can be fixed quickly and cheaply with the replacement of the small, lead weights which are stuck to the car's rim. While the wheels are being checked, it's a good idea to examine the tyres, too. A tyre with structural damage or a flat spot an also lead to this type of problem.
If this doesn't turn out to be the cause of the wobble, you then need to move on to other components like the driveshaft and universal joints and even suspension bushes and shock absorbers.
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