Editing Wheel sizing (section)

==Tire sizes==
{{main|Tire code}}
[[File:ATV Tire Parts.jpg|thumb|right|Example of tire sizing on an [[all-terrain vehicle]].]]
Modern road tires have several measurements associated with their size as specified by [[tire code]]s like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in [[Millimetre|millimeters]]. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall expressed as a percentage of the nominal tire width. "R" stands for radial and relates to the tire construction. The final number in the code (e.g.,"14") is the mating wheel diameter measured in inches. The overall circumference of the tire will increase by increasing any of the tire's specifications. For example, increasing the width of the tire will also increase its circumference, because the sidewall height is a proportional dimension. Increasing the aspect ratio will increase the height of the tire and hence the circumference.

[[Off-roading]] tires may use a different measurement scheme: {{Code|Tread width × Outside diameter}}, followed by wheel size (all in inches) – for example 31×10.50R15 (787&nbsp;mm × 267&nbsp;mm R380 in metric designation). The size of the wheel, however, is denoted as {{cvt|8.5|x|20.0|in|mm}}. This means that the width of the wheel is {{cvt|8.5|in|mm}} and the diameter is {{cvt|20|in|mm}}.

===Load capacity===
Load capacity is the amount of [[mass]] a wheel will carry. This number will vary depending on the number of lugs, the PCD, the material used and the type of axle the wheel is used on. A wheel used on a free rolling trailer axle will carry more weight than that same wheel used on the drive or steering axle of a vehicle. All wheels will have the load capacity stamped on the back of the wheel. The [[Gross Vehicle Weight Rating]] (GVWR) is the maximum operating mass of a vehicle as specified by the manufacturer. In the United States this information is required to be on the vehicle's door placard. The load capacity of the total number of wheels on the vehicle combined must meet or exceed the vehicle's gross vehicle weight rating.