First, start with the wheel size for your vehicle. The wheel diameter in inches or millimeters is the fifth set of numbers and letters.
What do rim size numbers mean? This number represents the distance between the two bead seat areas where the tire is sealed onto the wheel. The wheel size also includes its width and offset. The width is the distance from each bead seat from inside to the outside. The offset determines how the wheel and tire set aligns with the wheel well.
The offset is how far inward or outward the mounting surface is in reference to the center-line of the wheel. The center-line is calculated by simply dividing the wheel into two equal halves. Les Schwab has the tools to accurately measure your center-line. A larger tyre will have a larger rolling radius, and as such will affect gearing, and the accuracy of your speedometer. If you fit larger wheels you need to fit lower profile tyres tyres with a smaller sidewall to maintain the same rolling radius.
Google 'Tyre size calculator' to work out what size tyres you need! Go to front page. A beginner's guide to wheel sizes You are here Home A beginner's guide to wheel sizes. Diameter This is always referred to in inches, and as the name suggests is the diameter of the wheel — not the tyre and wheel together. Width Again this is measured in inches. Aftermarket Wheels In general if you intend to keep the wheels on your car, or maybe even upgrade to ones of a model higher up the same range then you don't really need to concern yourself with any more wheel measurements.
Offset The offset is the measurement that dictates how far your wheels stick out. Centre Bore The diameter of the hole in the middle of the wheel is the centre bore. PCD This stands for Pitch Circle Diameter and refers to the number of wheel bolts and the diameter of an imaginary circle if it were drawn through the middle of the bolts.
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November 11, The last number is important, as it tells you what size wheel the tire fits. In our example, this number is 15, which means the tire fits a wheel with a inch diameter. Wheels and tires are important components of your vehicle. Though that may seem a little obvious, many drivers don't give a second thought to the tires they choose for the cars, which can lead to many unwanted problems. Know your car and avoid making dire tire mistakes to ensure your wheels are safe and are giving your vehicle the best levels of traction possible.
New Cars. Buyer's Guide. Type keyword s to search. Today's Top Stories. Does Tire Size Really Matter? Tips on Buying New Rims and Tires The average driver may not know exactly what they are looking for when they shop for new tires , but as long as you keep a few fundamental rules in mind, replacing tires and rims is easy. Letters you might see are: "P," for passenger vehicle tire. This letter also lets you know that the tire is made to meet standards in the United States.
When there is no letter, it means it's made to meet European standards. The two types have different load capacities. Tire sizes that start with these letters are intended to be used for light trucks. They'll have higher psi recommendations to better take on trailers and heavy loads.
Tires sizes with these letters are for trailer wheels only. More Tips TSW explains that sometimes, it's acceptable to have differently sized tires and rims for the front and back wheels, which is called staggered tires. You'll most often see this with muscle cars, such as the Mustang, Challenger, and Camaro. The reason this works is that the rear wheels don't have to turn like the front wheels do.
The larger your rim, the more difficult and expensive buying new tires will be.
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