Unless you’re replacing your car’s tires with the identical set that it came with, you’re going to face some decisions. What’s the story with treadwear? Can you replace a run-flat tire with something else? Are winter tires worth the investment?

Here are some answers—and specific recommendations—to inform your search for a new set of rubber.

Treadwear Rating: How Much Should I Pay Attention to That?

Among the specs you confront when tire shopping, treadwear is one of the more mysterious. If one tire has a treadwear rating of 400 and another is 600, does that mean the latter tire will last 50 percent longer? Not really, because although there’s a standardized Uniform Tire Quality Grade test to measure treadwear on specific roads in West Texas, the test is so easy that most tires get crazy-high scores.

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Your first step should be to choose the correct tire size for your vehicle. This will ensure that your tires are fitted properly and that they can perform their function smoothly. When choosing a best all terrain tires, take note of its load rating and inflation pressure. The load rating will indicate how much weight the tire can support while the inflation pressure refers to how much air pressure it needs in order to perform its function properly.