New tyres balanced twice - still vibrating

[OMITN]

Had a pair of replacement tyres on our Mazda CX5 family car. They were done by Halfords (Tyres on the Drive, as was).

On first driving on the motorway it was clear there was a vibration that wasn’t there before - through seat and steering wheel.

The guy installing fud say the balancing machine in his van was playing up.

So I’ve since had them back to have another go at balancing the wheels and still have vibration from 50-70mph (and presumably above).

Nothing else has been changed on the car and there was no vibration needle the tyre ch as age. So, if the wheels are balanced and nothing else has been changed any idea what it could be?

Thanks!

[OMITN]

Hi all - thanks for the inputs..!

Geometry, while I think needs a tweak, isn’t changed from before/after fitting.

Tyres are the same as were fitted OEM (not the first set on this car front or back) - Goodyears, so premium brand.

Wheels are OEM - no changes there.

Sounds like the culprit may well be egg-shaped tyres..! I’ll get back on to Halfords today.

Thanks all..!

[OMITN]

Pickled Piper said:

As above. Also, what brand of tyres did you have fitted? Budget brands are far more prone to this type of issue.

Any how, go back to the supplier

Goodyear. Will be back on at Halfords..!