How do you measure tire size

To get the tire size measure the outside diameter of the tire. The size is written on the outer sidewall.

A wheel with an actual Diameter of 18 will have an overall diameter of around 195.

How do you measure tire size. Is the width of the tire measured in millimeters from sidewall to sidewall. The first three-digit number in the tire size refers to the tire width. For instance in a size P21565 R15 tire the width is 215 millimeters.

The 3-digit number before the slash denotes the tire width which is measured from sidewall to sidewall and corresponds to the tread that contacts the road. The measurement is given in millimeters and all 4 tires must have the same width. For instance if the first number is 225 the tire tread is 225 mm wide.

P Passenger Car Tire. The first letter on a tire indicates the tires class. P designates this tire as a passenger car tire an LT before the tire.

245 Section WidthTread mm 45 Aspect Ratio. Ratio of Sidewall height to width Z Speed Rating S 112mphT 118mph. The first number to appear in your tire size information is the width in millimeters of the correct tires for your vehicle.

P 225 70R16 91S. Tire width always refers to the measurement from one sidewall to another. Thus a tire with the measurement P225 is for a passenger vehicle and has a nominal width of 225 millimeters.

How to Measure Car Tire Size Make sure the tire is completely inflated and is mounted on the vehicle Measure the width of the tread of the tire. This is the distance from the treads inner edge to its outer edge. Measure the diameter of the tire.

This is the outside width of the tire. You place the. When measuring for the Actual Diameter you will want to measure from the inside of the Barrel of the wheel Shown by the Red Line in the above photo.

A wheel with an actual Diameter of 18 will have an overall diameter of around 195. Inch measurement tires are fairly easy to understand however metric tires use a more difficult system to read. 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. Measure the Diameter first.

Measure your tire across the face from one side to the other at the point where the face of the tire brakes on to the tread. Move your tape up and down till you have achieved the greatest distance. This will be the Diameter of the tire.

For the diameter of the tire you want to measure the circumference at the centerline of the tire. The easiest way to measure this distance is using a string. Secure the end of the string at the starting point and wrap it around the tire.

Mark the string where it intersects the starting point. Measure the tire from top to bottom for a precise measurement. Take the measurement over not to the side of the hub.

Depending on your needs you may also measure the hubcap in a similar way. Start at the bottom of the hubcap and finish measuring at its tip. Use a stiff tape measurer to calculate the wheel diameter.

The tire size determines the range of rim widths that are safe to use. For example a tire size 24545R-20 has a rim width range of 75 to 95. This means that this tire size would fit a rim size of.

To get the tire size measure the outside diameter of the tire. Sometimes the overall tire size is written along the sidewall of your tire. Though this wont provide you with information regarding your hub length and bearing size those are separate measurements it will help determine which tire size you need.

Learn how to measure different types of tires and rims with the charts below. Maintain and repair tires with Gemplers selection of tire supplies ranging from air gauges chucks flat tire prevention supplies tire bead breaking tools and much more. Look at the last two numbers in the sequence 22540 The 40 means that the height of the tire measured from the tread of the tire to the rim of the wheel is 40 percent 040 of the section width 225mm.

Use your calculator to work out the height of the tire from rim to tread. 040 x 225 90mm. Measure the tire size by looking at the width height and inner diameter of a tire.

The size is written on the outer sidewall. P20540R16 is a common tire size notation showing all these. The P indicates passenger car.

WaitWhat do the Numbers Mean. Stand the bike up using a kickstand or just lean it against a wall. Place a tape measure against the center of the bicycle wheel and then extend the tape in a straight.

Measuring width is just as easy. Take your tape.