Radial tires are made specifically to reduce the wear and tear of your car whereas goodyear tires are simply regular tires.
They all have to be the same size. They can be different brands but even then make sure the tires on the front axle are the same brand an the tires on the rear axle are the same brand. Do not mix brands on the same axle.
Radial tires are better for freeway/street driving. They grip the pavement better and have better gas mileage. Cross ply tires are good for off-roading and any other kind of rough travelling.
No, do not mix bias tires with radial tires.
These are some of the tire brands that are made in America: BF Goodrich Super Sport A/S, Dick Cepek Radial FC II, Dunlop Radial Mud Rover, Firestone Precision Sport.
yes, it is not recommended however. The safest thing to do is have all four tires be identical (same brand, tread pattern, speed rating, load index). At least if you are going to mix and match change the tires two at a time.
manufacturing process of bias & radial tires
no
Procomp Tires offer specialty tires for all sorts of conditions. The produce tires like the Xtreme All Terrain Radial, All Terrain Radial, Xtreme Mud Terrain Radial, Pro Comp Xtreme M/T 2 Radial, and the Xtreme Trax Radial.
Michelin makes many different tires and they do cost more than other brands, but are well known as excellent tires for grip and mileage.
Yes, as long as both are the same on each axle. Additionally: they have to be the same "type" of tire. You can not mix Radial Tires (example; P255 65 R17) with Bias ply or Diagonal tires (example P255 65 D17) on the same vehicle.
You can find radial tires in many different stores like Canadian Tire and also at tire dealerships like BF Goodrich. It is not recommended to buy tires online. It is best to buy tires somewhere where they can be properly put on your vehicle.
Nokian tires are more environmentally friendly then any other brand, however there is no other difference. You would definitely save money and help the planet by going with the nokian tires.