What Does R Stand For On Tires?

What does the 265 70r17 mean?

This number indicates that your tire has a width of 265 millimeters. 70. This number means that your tire has an aspect ratio of 70%. In other words, your tire’s sidewall height (from the edge of the rim to the tire’s tread) is 70% of the width. In this case, the sidewall height works out to be 185 millimeters.

What’s the difference between Z and R tires?

In both the ZR and R, R means radial. Nearly all passenger tires today are Radial. Z is the speed rating of the tire. Z rated tires are high performance tires.

What does R and D stand for on tires?

The difference between the two trailer tire sizes is that the letter D in the first size you listed ST205/75D15 stands for bias ply and the letter R in the tire size that they put on your vehicle stands for radial.

What does 70 R mean on a tire?

The number 235 is the cross-section width in millimeters, while 70 is the ratio of sidewall height to cross-section width ( 70 percent). R means radial-ply construction and 16 is the wheel diameter, in inches. Load index. This number is based on the weight the tire can safely carry.

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Can I use 235 tires instead of 225?

Yesthat size will work 100% perfectly, as it is the exact same diameter as the 225 /75-16. 235 /70-16 is actually a shorter tire.

What’s the difference between 265 and 285 tires?

The larger 285 /70R17 tire in the photo above stands over an inch taller and is nearly an inch wider than the 265 /70R17 size. The width of the tread is also a half-inch wider. Many late-model domestic trucks accept this difference in size.

What does Y mean on a tire?

Y rated tires have been tested at speeds up to, and in excess of, 186 mph (300 km/h) under optimal conditions. If Y speed rating is indicated without parentheses (as normal), this means the tire is rated up to 186 mph.

What does XL mean on a tire?

Reinforced or XL (Extra Load) tires are specially reinforced tires. They can carry heavier loads than tires of the same size.

What happens if you go over tire speed rating?

The speed rating is there to let you know that you shouldn’t exceed that speed with that tire. If you do for a sustained period of time the air in the tire will heat up and expand causing the tire to explode. It is pretty simple.

What does load D mean on tires?

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like # AM1ST77, the capacity is 1,610 pounds at 65 psi.

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What are the three types of tire construction?

There are three main types: clincher, wired and tubular. Most bicycle tires are clincher and have a bead that presses against the wheel rim. An inner tube provides the air pressure and the contact pressure between bead and wheel rim.

Are radial tires better than bias ply?

Radial tires dissipate heat better than bias – ply tires, which allows them to travel at higher speeds for greater distance. “Due to a rigid tread, single steel body ply construction and the absence of multiple nylon plies, radials are much more effective at reducing heat,” says Mills.

What is the difference between 70 and 75 tires?

The difference will be in the height. The sidewall of a 70 -series tire will be 70 % of the width, a 75 series will be 75 % of the width. If you want the same HEIGHT in a 70 series, then you need to go wider in the width — about 219.

Are wider tires better?

From a safety point of view, both types have their good sides: On a dry road, wider tires will offer more grip than narrow ones, but the risk of aquaplaning will be higher with wide tires. – In the winter, narrow tires are better under extreme conditions as they provide higher surface pressure against the road.

Are LT tires better?

Usually, LT tires have deeper tread depths than their P-Metric counterparts. Officially, LT tires should always be replaced with LT tires. P-Metric tires are passenger tires that are better suited for on-road use. If a P-Metric tire size is chosen, the tires should be able to carry at least 1,238 pounds.

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