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While standard SAE tire sizes are easy to understand a 35x1250-16 tire runs 35 inches tall by 125 inches wide for a 16 inch wheel many popular tires particularly those under 35 tall use harder to visualize metric dimensions a 31575R16 tire is 315 mm wide with a sidewall height that is 75 of the width for a 16 inch wheel. 255The width of this tire size is 255mm wide.
The first number in this series refers to the tires section width or the distance from sidewall edge to sidewall edge measured in millimeters up and over the tires tread.
How to read metric tire size. How to read metric sizes. P25560R17 102V Tire Class. PTire tire class of this tire size is P which means it is a passenger car tire.
The first letter in the. 255The width of this tire size is 255mm wide. The first number in a metric tire size is the section.
The letter P at the beginning of the Tire Size tells us the tire is a P-Metric tire referring to tires made to certain standards within the United States intended for Passenger vehicles. If a tire size has no letters at the beginning this indicates a Euro metric tire. P-Metric and Euro-Metric tires may have different load capacities.
Section width divided by 254 Ex. 225 254 886 Section Height. Tire width times aspect ratio Ex.
886 x 70 620 Overall Diameter. Section height times 2 plus rim diameter Ex. 620 x 2 15 2740.
Manual or on the vehicle tire placard usually found on the door jamb or on the glovebox or console door for either size tire. Related Links How to Read Speed Rating Load Index Service Descriptions Plus Size Wheels Tires Sidewall Markings Tire Size Conversion Chart Tire Size Guide. After reading this short guide youll be a master at reading and understanding tire measurements.
There are two types of size measurements. Metric covers a majority of tires people buy and its more difficult to understand so were going to go ahead and start there. There are seven sections for metric sizing.
The first letter on a tire indicates the tires class. P designates this tire as a passenger car tire an LT before the tire size would mean the tire is a light truck tire and a European metric tire would have no letter before the tire size. 245 Section WidthTread mm.
The first number on a metric tire is the width in millimeters. Divide this number by 254 to get the inch equivalent as there is 254 mm in 1 inch. The third number generally preceded by an R is the wheel diameter.
The sidewall or aspect ratio are used in metric tire sizes to determine the overall height of a tire. Metric tire sizes are listed with the width first then the sidewall height shown as a percentage of the tire width usually followed by an R to designate radial construction and lastly the wheelrim size. Passenger vehicle tires are usually in metric form and larger truck tires can be shown as metric or standard size.
This diagram explains what each number or letter means. A standard sized tire will. While standard SAE tire sizes are easy to understand a 35x1250-16 tire runs 35 inches tall by 125 inches wide for a 16 inch wheel many popular tires particularly those under 35 tall use harder to visualize metric dimensions a 31575R16 tire is 315 mm wide with a sidewall height that is 75 of the width for a 16 inch wheel.
How to Read a Metric Tractor Tire Size. Metric Size Conversion Example. Tire Size 28085R24 Metric Tractor Tire Size Conversion.
Locate your tire size on the sidewall of the tire. The first number represents the overall WIDTH when mounted and inflated to the proper air pressure but it is measured in millimeters. Divide this number by 254 to convert to inches.
This will become the second number for a traditional tractor tire size. The first number in this series refers to the tires section width or the distance from sidewall edge to sidewall edge measured in millimeters up and over the tires tread. It may be about the outer tire diameter 275 by the width 2.
A cross country bike has a tire measuring 19 inches to 225-inch width range. All mountain bikes have tires 225 inch to 24-inch width. But the downhills bike can withstand the abuse of drops as well as a rock garden are decorated with tires ranging up to35 inch wide.
Metric Size Expression A metric tractor tire sizes expression may look something like 52085R42 The 520 part means the tire is 520mm wide R means its a radial tire and 42 is the rim size expressed in inches just like the standard method. That wasnt too hard but wait theres more. In other words its sidewall height divided by tire width.
In this example the aspect ratio is 65 meaning the sidewall is 65 percent as high as the tire is wide. To get the sidewall height take the tire width of 215 mm and convert it to inches 846. Then multiply this by65 and you get 55 inches the sidewall height in inches.
Locate your tire size on the sidewall of the tire. The first number represents the overall WIDTH when mounted and inflated to the proper air pressure but it is measured in millimeters. Divide this number by 254 to convert to inches.
The first three digits indicate the section width or cross section of the tire in millimeters. The section width is defined as the widest point of the inside sidewall to the widest point of the outside sidewall when mounted on an appropriate wheel. For this ZE950 tire the section width is 245 millimeters or 96 inches.
High flotation codes begin by listing the tires diameter which is a measurement of the tires height in inches. The diameter will be a two-digit number. Our example tire has a diameter of 35 inches.
Flotation codes next list the tire width which is the width of the tire in inches.