Yes, all you need to do is figure out what kind of a vehicle you have, then do searches on what tires this have a minimum required size of. Then figure out where you can go to buy them.
Tire Rack has an online site that walks you through all the sizes including OEM.
There is a wide variety of online tire dealers with all different types of brands and all different sizes to fit any vehicle. Always do your research on a company before you buy and be knowledgable of their return policy and warranties for just in case.
Look on the driver's door support and there is a decal with sizes and tire pressures. DO NOT mix tire sizes as it will disrupt the antilock brakes.
One can find a tire size chart online in tire manufacturer websites or tire selling company websites. In addition, one can go to a near car parts seller store and see tire sizes in a chart.
No, never mix tire sizes.
Low tire pressure, tire sizes that do not match, out of alignment, or bent suspension parts.Low tire pressure, tire sizes that do not match, out of alignment, or bent suspension parts.
To compare tire prices one would have to research different brands online or by calling around to tire repair shops in their area. Tire shops such as GoodYear and Discount tire often have lower prices.
Tirerack.com has a variety of tires for all sorts of cars and the ship them to you for a good price. Another good online site for tire purchases is tires-easy.com who has an array of tire sizes for a good price and the ship them to you.
Your correct tire size is on your door sticker.
315/70/17
Generally no for vehicles that were not designed to use differing tire sizes. For vehicles designed to use equal sizes, using different sizes can lead to unsafe handling quirks. This is especially true for using different sizes on the left and right of front or the rear. That is why a limited use spare tire has restrictions on speed, etc.
Dodge charger tire sizes can vary. If you have the all-season tire option, then the size is typically 245/45R20 on all four wheels. If you select the summer tire/high performance option, then the rear tires are 255/45R20. Either way, the rims are 20x9inch. There are a number of owners using a wide variety of tire sizes - 275/40R20 are common wider rear tire sizes and work on the 9 inch stock wheels. You can find other options by browsing the discussion forums of SRT8 owner's clubs online.