What is the middle number in tire size

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.

Is the middle number on a tire the width?

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. … The bigger the aspect ratio, the higher/taller the tire’s sidewall, or “profile” as it’s sometimes called. The aspect ratio is indicated on the tire sidewall as a percentage.

Can you change the middle number on tires?

That said, the only dimensions you can change are the width and aspect ratio — never the wheel size, unless you buy replacement wheels — and you should always strive to keep the total height of the tire the same as the OEM. So, if you widen the tire, you may need to decrease the aspect ratio, and vice versa.

Can I use 60 instead of 65 tires?

Physically, yes they will fit. It is recommended to stay within 3% of the original tire size on the car though. The size you have is 3.09% smaller, so not recommended.

What does R17 on a tire mean?

R17 on a tire means that the rim size needed would be 17″. The “R” actually stands for radial, not rim and is the type of technology the tire uses.

Can I use 235 tires instead of 225?

235 tires are also preferred over 225 tires for professional stunting because they offer much more stability to the vehicle and hence are much safer. One of the biggest advantages that 235 tires have is the reliable handling it offers. A driver of a 235 tire car can easily feel the smoothness and control there is.

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.

How much taller is a 65 tire than a 60?

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.

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 does 60 R mean on a tire?

60 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 60 means that the tire’s section height is 60% of the tire’s section width. R indicates the construction used within the tires casing. R stands for radial construction.

Article first time published on

What does the 265 70r17 mean?

3 Answers. Pushkar Apte. 265 means the width of the tire is 265mm. The larger this number the wider is the tire. 70 is the aspect ratio which means the height of the sidewall of the tire (from the edge of the wheel/rim to the top of the tread) is 70% of its width, in this case 70% of 265mm = 185.5mm.

What is the second number in tire size?

The second number is the section width (sidewall to sidewall) measurement in inches. Again, fairly simple. After the section width comes a letter that indicates the type of internal construction: 33X12.

Can 245 tires fit 235?

Expert Reply: You might be able to replace a 235/65-17 with a 245/65-17 tire. The tires you have now, 235/65-17, are about 9.25 inches wide and 29 inches tall. … On vehicles, especially newer vehicles, there is very little space to go to a larger tire without making other modifications.

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 SL on a tire mean?

For example, a “C” load range indicates that a tire is equivalent to a 6-ply construction tire. … However, you may find these tires marked as Standard Load (SL) or Extra Load (XL or Reinforced). Both have a 4-ply rating, but the Extra Load can support additional load at up to 42 PSI while the Standard Load is 36 PSI.

What is a good speed rating on a tire?

SPEED SYMBOLSY300186

What does 99H mean on tires?

235/55R17 99H- The load index (99) is the tire size’s assigned numerical value used to compare relative load carrying capabilities. The higher the tire’s load index number, the greater its load carrying capacity. 97 = 1,609 pounds. 98 = 1,653 pounds. 99 = 1,709 pounds.

What does 111h mean on tires?

· 3 years ago. 117H is the load and speed rating of the tire. 117 means that tire has a maximum rated load of about 2833 lbs, while the maximum rated load of a 111 is 2403 lbs. On the other the letter is the speed index, a tire with a speed index has a maximum rated speed of 130 mph.

What does 98V mean on a tire?

The 98V is load index (capacity) and speed rating: The 98 says the tire can safely carry — when properly inflated — 1,653 pounds. This code ranges from 60 (551 pounds) to 114 (2,601 pounds). The speed rating (sometimes listed twice — in front of the R and always here) ranges from M (81 mph) to Z (149+ mph).

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.

Should I change all 4 tires?

Some manufacturers of all-wheel-drive vehicles recommend that all four tires be replaced, not just one or two, because a new tire will have a larger overall diameter than the other tires. … The best approach, though, is to replace all four if the tread on the old tires is significantly worn.

How much wider is a 245 tire than a 235?

In selection width, there is a -10 or -4% difference between 245 mm old tire and 235 mm new tire.

What is the difference between 265 70r16 and 265 75r16?

Going from 265/70 to 265/75 is increasing the height, or diameter, of the tire. The tire will be an inch taller. 265 is the width, so stock size is 265 millimeters wide. The speedometer will be a little off because the taller tire does not rotate at the same speed as the stock size.

Can I use 265 70R17 instead of 265 65r17?

They’re usually for a range of sizes, so one’s that fit 265/65r17 would probably fit 265/70r17 as well, unless the 65 series is the max out for that chain.

How many inches is a 265 65 tire?

265/65-17265/70-17Diameter inches (mm)30.56 (776.3)31.61 (802.8)Width inches (mm)10.43 (265)10.43 (265)Circum. inches (mm)96.02 (2438.82)99.29 (2522.07)Sidewall Height inches (mm)6.78 (172.25)7.3 (185.5)

What does the 265 mean in tire size?

You’ve probably seen the size code on your tire’s sidewall. … P = Passenger Tire (Light Truck Tires will begin with the prefix LT). 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.

What is the difference between 275 60r20 and 275 65r20?

they will be fine, speedo will be out by a hair but nothing noticable, the 65 is the height of the sidewall so its just a slightly smaller profile. 275 is the width in millimeters and the 65 r 60 is the percent of that. so 14 MM less per sidewall so 14×2 is 28 MM so just over an inch shorter.

How tall is a 70 series tire?

The number 70 is the aspect ratio, sometimes called the profile. This is the ratio of the sidewall height to the width. The sidewall height can be calculated by multiplying the ratio (70 or 0.70) by the width (225): 225 millimeters x 0.70 = 157.5 millimeters.

What is 205 on a tire?

The first three numbers (205) indicate the width of the tire tread in millimeters. … This is indicated in percentage of the tire width. “R” stands for the construction method of the tire indicating the tire is a radial tire. The following two numbers (16) indicate the diameter of the wheel rim in inches.

What does r19 mean on a tire?

Diagonal. 19. The tire size was designed to fit rims or wheels that are 19 inches in diameter.

Can 265 tires replace 255?

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.