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The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire’s width. The bigger the aspect ratio, the bigger the tire’s sidewall will be.
What do tire numbers and letters mean?
Also known as the service description, the number indicates the maximum load the tire can support when inflated properly, and the letter represents the maximum speed capability of the tire. In our example, a load index of 92 means that the tire can support 1,389 pounds at maximum air pressure.
What are tires specs?
The first number to appear in your tire size information is the width, in millimeters, of the correct tires for your vehicle: P225/70R16 91S. Tire makers calculate the aspect ratio by dividing a tire’s height off the rim by its width. If a tire has an aspect ratio of 70, it means the tire’s height is 70% of its width.
Can I use 225 tires instead of 235?
Can 225 fit 235 tires? Yes, they can. 225 tires are 10 mm narrower and 15 mm lower in height than the 235 tires. Besides, 235 tires are wider than 225, and so we recommend checking the owner’s manual.
Will a 65 tire fit a 60?
Yes, the only real difference is that ratio between the tread width and the height of the sidewall will change. The lower the middle number the lower the profile of the tire the larger the number the higher the tire profile.
How do you read tire letters?
TIRE SIDEWALL MARKINGS P =Passenger Car Tire. The first letter on a tire indicates the tire’s class. 245 =Section WidthTread (mm) 45 =Aspect Ratio. Z =Speed Rating S = 112mphT = 118mph. R =RadialConstruction. 19 =WheelDiameter(inches. 98 =LoadIndex. W=Speed Rating.
What do the 3 numbers mean on tire size?
Tire Width 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 P215/65 R15 tire, the width is 215 millimeters.
What does 265 mean on tires?
265 = Section Width in millimeters (measured at the widest part of the tire from sidewall to sidewall) /60 = Aspect Ratio or section height to width ratio as a percentage.
Can I use 245 tires instead of 235?
So you have already identified the difference between 235 and 245 size tires. It is obvious that 245 is bigger than 235, still, both tires’ sizes are pretty common and could be interchangeable at times.
What does 50r mean on tires?
50 is the two-figure aspect ratio. This percentage compares the tire’s section height with the tire’s section width. For example, this aspect ratio of 50 means that the tire’s section height is 50% of the tire’s section width. R indicates the construction used within the tires casing. R stands for radial construction.
What is the best tire speed rating?
Tire Speed Rating Chart Speed Rating Symbol Speed (mph) Speed (km/h) N 87 mph 140 km/h P 94 mph 150 km/h Q 100 mph 160 km/h R 106 mph 170 km/h.
Do bigger tires give a smoother ride?
Avoid bigger wheels if you want a smoother ride. As a general rule, bigger wheels result in a rougher ride. Switching to a smaller wheel and a thicker tire can give you a smoother ride without any major modifications to your car.
Is wider tires better?
Overall, wider tires are better for dry surfaces and for high-performance vehicles. Greater surface area allows for better day-to-day traction and durability.
Should I change all 4 tires?
It’s always best to replace all 4 tires at the same time. This is because all 4 tires spin independently of one another, and different tread depths and/or styles can cause them to spin at different speeds. That could potentially damage the drive train, and possibly affect an indirect TPMS system if the vehicle has one.
Which tire is wider a 65 or 70?
The series number in a tire-numbering system refers to the aspect ratio of the tire’s sidewall height to its width. A series 65 tire’s height is 65 percent of its width, a series 70 tire’s height is 70 percent of its width and so on. These differences in height affect both performance and safety issues while driving.
What is a wider tire 60 or 65?
The 65% aspect ratio (as in 235/65/17), compared to 60%, adds almost 12 mm (1/2″) to the radius of the tire (0.65-0.60)*(235mm)=11.75mm.
What is the difference between a 70 and 75 series tire?
So if you have a 70-series tire, that means the sidewall height is 70 percent of the tire’s overall width. The “75” is the aspect ratio, and it indicates that the tire’s sidewall height is 75 percent of the claimed 205mm section width.
What does Zr mean on tires?
Tires having a maximum speed capability over 149 MPH may have “ZR” in the size designation. Tires with a maximum speed capability over 186 MPH are required to include “ZR” in the designation. Below are examples of tire sizes with a “ZR” speed rating.
What does the 40 mean on a tire?
In this case, the tire is 245 millimeters at its widest point (when it’s mounted on a wheel of a specified width). 2) The number after the slash indicates its aspect ratio, or profile. This tire’s sidewall height is 40 percent of its width.
What’s the difference between r17 and r18 tires?
It comes down to more subjective measures, apparently. The smaller 17-inch tires represent the most comfortable ride thanks to the larger sidewall. The 18-inch tires create a bit more road noise, and this is further exacerbated when the car jumps up to the 19-inch wheels and tires.
What does 75 mean on a tire?
75—This is the tire’s aspect ratio, comparing the tire’s height to its width. For this tire, it means its height is 75 percent of its width. R—This defines the construction within the tire. “R” stands for radial. “B” means belted bias and “D” stands for diagonal bias construction.
How wide is a 225 tire?
Equivalency table Rim width Minimum tire width Maximum tire width 7,0 Inches 195 mm 225 mm 7,5 Inches 205 mm 235 mm 8,0 Inches 215 mm 245 mm 8,5 Inches 225 mm 255 mm.
