HOW TO FIND OUT TIRE SIZE
You will be able to find numbers and characters on the side of the tires. You will see on most modern tires the size shown like this: P265/50R15, by reading this number we can conclude that the tire width is 265mm, aspect ratio is 50% and is mounted on a wheel which has a diameter of 15 inches. By deciphering these numbers you can find the exact tire chains for your needs.
THE EXACT TIRES TO CHAIN UP
Usually you should choose the drive tires to chain up with tire chain. On vehicles with front-wheel drive this would be the two front tires, on vehicles with rear wheel drive this would be the rear tires. If you’re not sure which type of drive system you have, then check the vehicle owner’s manual. Now if your vehicle is all wheel or four wheel drive, and you only intend to chain up two tires, don’t forget to consult the vehicle owner’s manual for details about what axle to chain up. If you’re not feeling comfortable with chaining up only 2 tires on your 4WD vehicle, put tire chains on all four tires.
Under normal driving conditions, the traction on all wheels are about the same, making you feel normal when asserting brake, acceleration and cornering. If you’re driving on the snow and ice you won’t find the balance under normal condition. If only front tires get chained up, the rear of the vehicle can swing during braking and driving. If you only put snow chains on rear tires, the steering ability of the vehicle is limited. To balance the force, you should put snow chains on all tires, driving or not. In most cases the snow chains on the market are sold in pairs, if all tires need to have snow chains on, you must purchase two pairs. Don’t forget there are truck tire chains and passenger car tire chains , the truck tire chains usually are stronger and more expensive than car tire chains.