No. If you have one set of tyres which is larger than the other set, only one set will be bearing that weight. This is going to cause undue stress and wear on your tyres, and could very easily put you in violation of weight laws, since those specify the area of tyre which much make contact with the road to safely distribute the weight without causing damage to road surfaces.
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.
Yes - as long as the tyres on the same axle have the same tread pattern.
No, not less one of the tires is out of balance. But it is never, ever, a good idea to have two different size tires on the same axle. This is a big no-no.
It is ok as long as you have the same size on each axle. In other words you must have the exact same size tire on the front axle or the rear axle. Never mix sizes on an axle.
First off you should not install tires that are not the correct size. But if you do, make sure the tires on each axle are both the same size. Both front tires same size, and both rear tires same size.
Yes, IF the same size on each side of axle. ie, both front the same, both rear the same but front/rear can be slightly different.
Yes , you can, as long as same tires on one axle.
YES, both tires must be the same size on the same axle, be it posi-trac or non posi-trac. Never, ever, mix sizes on any axle.
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.
Yes, if you mount as a pair. Both tires on axle must be the same
By ratio if you mean size, the answer is no unless the car comes from the factory with a different size rear tires than front tires like some sports cars. In that case you would have 2 tires the same size on the front and 2 tires another size on the rear. You should never ever run 2 different size tires on the same axle. Therefore you would never have a situation where you would have 3 tires one size and then 1 tire another size.
You can, but it isn't recommended. Idenctical tires, not merely tires from the same manufacturer, are preferred.Different tires, even from the same manufacturer, have differing tread patterns to achieve different purposes. Some tires are designed for rain performance, some for high-performance handling, and others for fuel efficiency. Installing different tires, and thus differing patterns, mean different handling, performance, and even fuel efficiency characteristics under varying road conditions. You get the best out of none of your tires when you mix-and-match.Ideally, all four wheels should have identical tires. If that's not possible, ensure that you have identical tires at least on the same axle (pairs on the front or the back).