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Wheels Articles Useful information
There are five main components to identify the correct lug nut or wheel lock:
- Thread Size
- Thread Pitch
- Seat Type
The sidewall of your tires is filled with important information that tells you everything you need to know about your tire. The numbers can be a bit overwhelming to the untrained eye, so the best way to understand tire markings is to take an example and break it down, bit by bit.
Below are tips and information to help you learn how to read tire size and other tire markings commonly seen in the U.S.
The centre bore is the size of the hole in the centre of the wheel where the spigot fits through. The centre bore, (also known as spigot size), is the diameter of this hole, usually measured in millimetres.
PCD (Pitch Circle Diameter) is the measurement of the diameter of the imaginary circle drawn through all of the wheel bolts or studs on a wheel. It is also known as the 'bolt circle'.
The offset of a vehicle's wheel is the distance between the centerline of the wheel and the plane of the hub-mounting surface of the wheel. It can thus be either positive or negative, and is typically measured in millimeters. Offset has a significant effect on many elements of a vehicle's suspension, including suspension geometry, clearance between the tire and suspension elements, the scrub radius of the steering system, and visually, the width of the wheel faces relative to the car's bodywork.
There are a number of different systems in use today that describe the various tire sizes used on performance, passenger and light truck vehicles. An attempt is currently underway to develop a worldwide system, but presently you must be familiar with several different systems.
Have you ever been stuck on the side of the road with a flat tire? Do you want to be able to change a tire without having to ask for help?
Fortunately, changing a tire is a pretty simple task, provided you're prepared and willing to exert a little effort.
A flat tire requires immediate attention. A flat should be replaced with your vehicle's OEM (Original Equipment Manufacture) spare wheel/tire right away, until your tire has been inspected for punctures and leaks. If a puncture is found, it should be repaired promptly to prevent any further tearing. Tire patches should be applied carefully, to both the inner and outer parts of the tire. Unless you have the proper equipment and experience, a qualified mechanic should perform these procedures as they require dismounting the damaged tire from the wheel.
A tire's temperature grade indicates how well the tire can dissipate heat under test conditions, assuming proper inflation and maintenance of the tire.
Optimal tire performance requires correct inflation. Tire pressure can change over time due to climate changes, natural air loss, or other factors. To maintain proper inflation, you should check your tires periodically. Under inflation of tires can lead to early or uneven wear, traction problems, and stability problems.