Common sense. A square wheel/tire would not roll. Try rolling a brick.
Have the tires checked for being round. You can balance a square block but it won't roll smoothly.
Because square ones would result in poor gas mileage.
without air the tyres wont go round :/
If the trye has gone out of round (an MOT failiure ) Yes the car will shudder when driving.
The odds are 95% or better that the tires on your car are what are called "all season radials", and they are fine year-round. If you want, you can stop at any tire store and they will gladly tell you exactly what they are - usually no charge for that.
Check your tires to make sure there are not out of round and properly balance.
There can be a number of reasons, including, but not limited to out of round tires, tires out of balance, bent rim, worn or damaged suspension components, and so on. Take you car to a mechanic you can trust and have them diagnose the problem.
30 PSI (pounds per square inch) is average normal pressure for radial tires on a passenger car.
Square Polygon Triangle
Pounds per Square Inch AND Pounds per square inch. It is used to measure pressure, especially with tires.
drive shaft could be out of balance or tires could be out of round
Firestone Tires offer numerous tires that are great for your winter driving in the Colorado area. But the best are there all season tires they currently are offering. They will improve your winter driving and you can keep them on your car year round and don't have to worry about removing them ever.