Standard all-season tires are usually rated S (up to 112 mph) or T (118 mph). This letter denotes the maximum sustainable speed and is found directly after the load index. For all-season tires, use a tire with the speed rating recommended by your vehicle owner's manual or listed on the tire information placard found on the driver's doorjamb.(An LT tire is built for more demanding applications and costs more because of its tougher construction.) The key is to be sure the tire is engineered for your vehicle's demands and load. Tires are commonly split between metric tires for car and crossover vehicles, and LT, or light truck, tires.(Learn more about reading a tire sidewall in our buying guide.) It's a two- or three-digit number after the tire size. The load capacity index can be found on the tire sidewall. The replacement tires should have the same load capacity or higher to ensure they are rated to carry the same weight.The replacement tire should have an overall diameter that closely matches the original rubber to ensure that the speedometer, odometer, and overall vehicle dynamics aren't affected.For a wheel to fit properly, it needs to have the right lug nut holes and offset-the distance from the recessed hub mounting surface to the center of the wheel.Before making such a change, there are several things to consider. Putting performance aside, you may just want to switch to a more common wheel and tire size for the sake of availability and cost if you plan to hold on to a car for at least a couple tire changes. This can be done because it's fashionable and to improve three-season handling-a short sidewall has less roll and such lower-profile tires are typically optimized for grip. Or you may want to upsize to a larger wheel and a tire with a shorter sidewall. (However, a wider tire hurts winter traction by plowing through snow or even floating on top, akin to hydroplaning through a slushy.) A longer contact patch can help snow traction. This creates a longer footprint, also known as contact patch, where the tire connects to the ground. Retailers often recommend moving to a smaller wheel and using a tire with a taller sidewall, without increasing the overall tire diameter. This article has been viewed 70,023 times.A common situation in which you'd change sizes is when buying winter/snow tires. Howard is often referred to as “The Car Guy” for local TV stations and is a regular on TV’s Channel 3 Sunday, Good Morning Arizona monthly. Howard’s dedication to Community Tire Pros & Auto Repair has earned their team multiple awards and features including the 2021 Phoenix Magazine AZ State 48 “Best of the Best!”, the 2020 “Best of Phoenix” in Auto Repair, the 2013 Master SBD award, the 2013 National “Top Shop” award by Tire Review, the 2012 Diversity Champions Phx Business Journal, the 2009 BBB Ethics award, the 2008 Phx Chamber of Commerce Impact Award -” Small Business of the Year”, and the 2008 ASU Spirit of Enterprise award. Howard specializes in full-service auto repair and tire replacement and care for domestic/imported vehicles and large trucks. Howard Fleischmann is an Automotive Tire and Repair Specialist and the CEO of Community Tire Pros & Auto Repair, with ten locations throughout Phoenix, Glendale, Yuma, and Casa Grande, Arizona. This article was co-authored by Howard Fleischmann and by wikiHow staff writer, Sophia Latorre. This article has been viewed 70,023 times.
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