Tips to by Tires

QUESTION : What is the only part of your car that actually touches the ground?
ANSWER : Ideally, your tires.

Most of us don't give much thought to our tires until it's too late -- that is, until they fail. There are plenty of reasons to give your tires a little bit of attention now, before you find yourself on the side of the road at midnight.A well-selected and maintained tire can contribute greatly to your safety, increased fuel economy, better handling and stopping in all road conditions as well as providing greater comfort and ride quality.Walking into a tire showroom can be an overwhelming experience with literally hundreds of tire brands available, in a wide range of styles, construction, composition and price. To make the selection process easier and more effective we've put together these great tips for buying tires:

1. MAKE SURE THAT YOU ACTUALLY NEED NEW TIRES: Perform a quick visual inspection. If you see excessive tread wear, cracked sidewalls, or any discoloration or bulging, it's probably time for a new set.

2. MAKE SURE THAT YOUR TIRES ARE IN GOOD SHAPE: Inspect your tires for signs of uneven wear, which might indicate alignment or suspension issues. Check for signs like more wear on the inside or outside of the tire vs. an even wear pattern across the entire width of the tread.

a) If you put a new set of tires on a misaligned car, or one with bad shocks, you're throwing money away. The new tires will wear quickly and unevenly, and you'll need another set in a hurry.

b) Most tire centers will inspect your current set of tires, and give you an assessment of your car's condition before you buy. If you have a trusted mechanic, bring your car in for an inspection before heading out to the tire center -- an impartial opinion from an expert who isn't trying to sell you something is always desirable .

3. CHECK YOUR OWNERS MANUAL AND INFORMATION PLACARD: The manufacturer of your car has made a recommendation about the size and type of tires which work best with your vehicle, that information is found in the owner's manual and on the information placard.

a) The information placard on your vehicle is required by law, and is permanently attached to your door edge, door post, glove compartment door or inside your trunk lid. It may have been painted over on some older cars, but it's there.

b) If you don't have an owner’s manual, most manufacturers will sell you a replacement at a reasonable cost -- ask your dealer, or search on the manufacturer's Web site.

4. DECIPHER THE TIRE CODE: Perhaps the most confusing part of tire buying is figuring out what those numbers on the sidewall of the tire mean. They are part of a simple standardized code that is required by federal law in order to describe tires, and to identify them in case of a recall. Example of tire sidewall markings -- P215/60R16 95H M+S
  • First up is a letter or letters, indicating the tire's purpose: "P" for passenger cars or "LT" for light trucks are the most likely letters you'll see.
  • Next is a three-digit number. This is the tire's width (in millimeters) from sidewall edge to sidewall edge.
  • Then, a two-digit number which is the tire's aspect ratio, or the ratio of height to width. The smaller the number, the shorter the sidewall.
  • Next, a letter, "R," which indicates radial construction. Almost every tire you encounter will be a radial nowadays, unless you're buying tires for a classic car.
  • Then, another two-digit number, which is the diameter of the wheel that the tire is intended to fit.
  • Next, an optional two- or three-digit number. This is the tire's load index number, and its inclusion is not required by law. The load index number corresponds with the tire's load-carrying capacity.
  • Next, a letter. This is the tire's speed rating. Follow your manufacturer's recommendation.
  • Next, some more letters, usually "M+S" or "M/S." This stands for mud and snow, and applies to most radial tires sold in North America.

a) There are more numbers and letters, most of which you don't really need to worry about unless your tires are subject to a recall. They refer to the tire's place and date of manufacture, the maximum inflation pressure, maximum load rating, composition, materials, tread wear, traction and temperature grades.

b) Diving deeply into these ratings will yield a trove of information - most of which differs from manufacturer to manufacturer. Unless you are obsessive about your tires, you will probably be OK trusting in your tire guy's interpretation of the small print.
c) A good tire center will be able to talk you through these codes, and will know which tires are a good fit for your vehicle. You will have to choose between summer, all-season or winter tires, between extended tread life and better handling.

5. CONSIDER THE WHEELS. One of the most popular customization options on vehicles these days is a new set of rims. If your current wheels are worn or damaged, you might want to consider buying a new set when you replace your tires.

There's more than appearance to consider when you buy wheels, however. Try to match size as closely as possible to the manufacturer's originals. Even though bigger wheels might look great on your car, there's some complicated math to making sure that the tires and wheels match the car.The bigger the wheel, the lower the aspect ratio tire you'll be able to use. Inorder to make the car handle and turn properly, the outside diameter of the tire has to remain the same as the original tires as the wheel gets bigger -- which means shorter sidewalls. The sidewall is very important to handling, and it's also very important to comfort and noise. The shorter the sidewall, the less it will be able to flex when the car turns -- great for sporty handing -- and the less it will be able to absorb bumps and pavement irregularities. So a bigger wheel might lead to a harsher ride, and a squirrelly car.Additionally, the fact that custom wheels are often heavier than stock ones means they can negatively impact the suspension or fuel mileage.
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