[Help] Steering Wheel shaking !!

[Red]

As Ivan says.

If the tires/wheels are balanced, and the wheel bearings are good, then the problem is front end alignment/parts. In the US we would simply take it in to a front end (tire alignment) shop and say "it vibrates badly at speed" and they'd check all of that, routinely.

Shouldn't have anything to do with the rear but hitting one curb or pothole or railroad crossing can be enough to throw out front end alignment.