Quick Answer: What Is The First Number In Tire Size?

Does the first number in tire size matter?

The first three-digit number in the tire size refers to the tire width.

For instance, in a size P215/65 R15 tire, the width is 215 millimeters..

Can I put different size tires on my car?

What happens if wheels are different sizes. In a front- or rear-wheel-drive vehicle, as long as both rear wheels are the same and both front wheels are the same and the suspension geometry is set up to accommodate this, the vehicle will operate fine.

What does the R mean in tire size?

radial constructionP identifies your tire as a Passenger Tire. … R indicates the construction used within the tires casing. R stands for radial construction. B means belted bias and D stands for diagonal bias construction. 16 The last dimension listed in the size is the diameter of the wheel rim, which is most often measured in inches.

Can you put different width tires on same rim?

To keep the suspension and speedometer functioning correctly, both the stock diameter and width of the wheels and tires needs to be maintained. As a general rule of thumb, it’s safe to fit a tire up to 20 millimeters wider than stock on the original rim.

Can I use 235 65r17 instead of 225 65r17?

You could, and the 225/65R17 tire will fit your existing rims, but you don’t want to do so. The lesser 225mm width tire offer a narrower tread contact patch, as well as potentially a lesser load carrying capability, depending on model of tire.

Can I use 225 65r17 instead of 235 60r17?

Both fit 17 inch rims, so one obstacle is out of the way. 235/65R17 has a sidewall height of 153 millimeters (65% of 235 mm), while 225/60R17 has a sidewall height of 135 mm (60% of 225 mm). … You are reducing sidewall height by 18 mm (about 3/4″), so your car will be lower by this amount.

How much bigger is a 265 tire than a 255?

17inches. Since you only specified the first, I can only tell you that the 265 is 10mm wider than the 255. It’s important to note that the outer diameter (how far the wheel rolls in one revolution) is slightly more for a 265 than a 255 at the same aspect ratio as the sidewall would be larger.

Should I get H or T rated tires?

H rated tires have stronger construction than T rated tires. The concern may not be speed although a Subaru can exceed 118 MPH hence those tires however it may be load rating of the tires. … Not only is the “T” rating good for 118 mph, it’s good for CONTINUOUS use at 118 mph.

How do I know the size of my tires?

Find your tire size in your vehicle owner’s manual or on your door. Find the information in your vehicle owner’s manual in the glove compartment or on the tire information sticker on your driver’s side door.

What are the 3 numbers on tires mean?

B: TIRE WIDTH The three-digit number following the letter is the tire’s width (from side to side, looking at the tire head on) in millimeters. … In other words, it’s 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.

What does the last number on a tire mean?

The very last number in the sequence, “15,” is the diameter of the tire. This is an important number—this is the number you’ll refer to when you need to know your tire size! The “15” indicates that this particular tire would fit a rim with a 15-inch diameter.

What is the difference between 225 and 265 tires?

What’s the difference between 225 and 265 tires? … The first numbers is the distance across the tire. The 265 would be 40 mm wider than the 225. Be careful to make sure the diameter of the tire is the same with the different size tires.

What does the R or D mean in a tire size?

radialThe 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 P mean on a tire?

load indexIf you see a “P” in front of the tire size displayed on a tire’s sidewall it is a P-metric tire. … The higher the load index, the greater the load-carrying capacity of the tire.

What do the numbers on tires mean?

The “235” grouping indicates the width of the tire from sidewall to sidewall in millimeters. … The final number group, the “18,” is the size of wheel the tire fits. In our example size, the tire will fit a 18-inch wheel.

What does the 265 70r17 mean?

265. 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.

Can I use 235 tires instead of 225?

Yes…that 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 happens if you use the wrong tire size?

Effects of Wrong Size Tires Choosing too tall of a tire can result in a vehicle prone to rolling over, a dangerous concern for any driver. Tall tires may also rub against the inside of the wheel well. While not immediately problematic, this rubbing can lead to steering issues over time.

Is it OK to go up one tire size?

When changing the car’s original wheels and tires, the general rule of thumb is that you can go up or down by one inch. For example, if your car is currently riding on 17-in wheels, you can reduce the size to 16 inches. … Many times, a sport package option will increase both tire size and the suspension’s stiffness.

What is the difference between 225 and 235 tires?

225 is width from sidewall to sidewall. 60 is aspect ratio. It would mean the tire’s sidewall is 60% as high as it is wide. does that indicate a 235 mm tire is 10 mms wider.

Can I fit 225 Tyres instead of 215?

Probably not. All tires have a rim width mounting range of generally one to two inches. For example, a 225/50R18 sized tire can mount on a 18″ diameter rim with a width of anywhere from 6-8″. But your issue is not only will it fit but whether it is safe to use on your specific year, make and model of vehicle.