Tire Rack

The first three-digit quantity in the tire size refers to the tire width. For instance, in a measurement P215/sixty five R15 tire, the width is 215 millimeters. These tires usually require higher inflation pressures than passenger tires. The numbers are indicators of the scale, sort, and performance of the tire. Simply put, the bigger your tire, the extra of a grip your vehicle has on the street. According to iSee Cars, this improve in touch with the pavement offers your vehicle more to carry onto, growing its handling and skill to maneuver.

wheel and tire sizes

A tire size conversion calculator or tire diameter calculator is the easiest way to get the solutions you are in search of when it comes to tire sizes. For every tire measurement you enter our tire calculator suggests a number of tire sizes which might be with in a single inch larger and smaller of the entered tire dimension. Select every hyperlink to see an inventory of tires which are manufactured in that size.

Staggered Wheel Fitment

We name it the load “index” because the quantity doesn’t tell us the exact number of pounds the tire can carry, no less than not by itself. However, the number does correspond to a selected load capacity listed in an index. Beginning with 1 and ending with one hundred fifty, numbers in the load index symbolize carrying capacities of 99 to 7385 lbs. Tire width at all times refers to the measurement from one sidewall to another. Thus, a tire with the measurement “P225” is for a passenger car and has a nominal width of 225 millimeters.

The first number on a metric tire is the width in millimeters. Divide this number by 25.4 to get the inch equal as there’s 25.4 mm in 1 inch. The sidewall or side enter ratio are used in metric tire sizes to determine the general top of a tire.

To get the sidewall top, take the tire width of 215 mm and convert it to inches (8.46). Then multiply this by .65 and you get 5.5 inches, the sidewall peak in inches. You can see your original gear tire measurement in your owner’s manual. Some numbers on the sidewall are listed in metric while others are in inches. Plus, the best measurement for your car, truck or trailer can differ depending on tire use and your driving habits. The numbers characterize how broad the tires are, in millimeters, from sidewall to sidewall.

  • On vehicles with wheel studs, wheels have to be fitted with the proper sort of lug nuts.
  • Alternatively, smaller wheels are chosen to fit a selected fashion of car.
  • Metric tire sizes are listed with the width first, then the sidewall peak , followed by an “R” to designate radial building, and lastly the wheel/rim measurement.
  • The numbers symbolize how broad the tires are, in millimeters, from sidewall to sidewall.
  • Then have a tire skilled help you determine a tire size vary that may fit your automobile and driving objectives.

The second number on a metric tire is to calculate the facet wall measurement. Most passenger automotive tires at present are “metric” or “P-metric” (similar, with the “P” designating passenger automotive use). Metric tire sizes are listed with the width first, then the sidewall top , adopted by an “R” to designate radial building, and lastly the wheel/rim measurement. The same precept of changing an inch in wheel diameter but compensating for that inch within the top of the tire’s sidewall can be utilized to downsizing your wheels as well. Keeping the overall diameter of your tires the same additionally signifies that you received’t notice any modifications in your speedometer. Speedometers often calculate your automobile’s velocity by measuring how often your wheels are spinning. If a considerably completely different tire diameter causes your wheels to show more or less regularly than it used to, your speedometer received’t give you an correct pace.

Diameter Tire Calculator Chart

For example, a tire with velocity ranking “S” is rated for as much as 112 mph, while a tire rated “R” is as much as 106 mph. Of course, you must all the time follow legal pace limits on roadways. Radial development means the tire’s internal ply cords are oriented in a radial direction, from one bead over to the other, basically perpendicular to the axis of rotation. Assuming they’re the right dimension, you’ll find tire measurement data on the sidewall of your present tires. However, irrespective of where you discover your tire dimension, you’ll have to decipher a sequence of numbers and letters. Installing the proper tires in your vehicle is important to the general efficiency and safety of your vehicle.