# what does the middle number in tire size mean

What Does The Middle Number In Tire Size Mean? Is the ratio of the height of the tire’s cross-section to its width. 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.

Is the middle number on a tire the width? 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 width always refers to the measurement from one sidewall to another.

Which tire is wider 45 or 50? got that 1 wrong, the 45 and 50 is a percentage of the width, so the difference between 45 and 50 profiles is 5% of the width.

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.

## Can I use 70 instead of 65 tires?

Generally, series 65 tires are more expensive than series 70 tires. If you’re choosing a series 70 because you want a faster tire, your vehicle’s performace can suffer if the series 70 tire fits but is not compatible with the tire recommendations for your vehicle.

## Does the middle number on tires matter?

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.

## Can I use 235 tires instead of 225?

235 tires are one of the strongest, most durable, and reliable tires available for sub-heavy vehicles. 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.

## Which tire is wider a 40 or 45?

So on a set of tires that are 215mm wide, a /40 profile tire would have an 86mm tall sidewall, and a /45 profile tire would have a 96.75mm sidewall. So that’s about a quarter inch of difference between the two, which as stated isn’t going to be very visible.

## Which tire is wider a 70 or 60?

The series is a % of the sidewall compaired to the width. A 70 series tire sidewall height is 70 % of the tires tread width, a 60 series tire has a sidewall hight of 60% of the tires tread width.

## What is the difference between 50 and 55 on tires?

The 225 is the width of the tread, in mm. The 50 (or 55) is the height of the sidewall, as a percentage of the width. That’s your aspect ratio. With a 55 aspect ratio, and a 225 treadwidth, you’ll end up with a tire that is 3/4 of an inch taller that the 225/50.

## Is a 70 or 75 tire wider?

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.

## Can I put 60 tires on 55?

Yes…the wheel/tire combo has an overall diameter/circumference that should be maintained with 3% (+/-) the original spec. When you plus size wheels…the aspect ratio (height of the tire) decreases to compensate…and maintain the orig diameter/circumference.

## How much difference in tire size is acceptable?

When changing tire sizes, we recommend staying within 3% of the diameter/height of the original tire. Any more than this and you face the risk of brake failure.

## What is the difference between 265 70R16 and 265 75R16?

Judging by the tire size index, 265 70R16 has an aspect ratio of 70 whereas 265 75R16 has an aspect ratio of 75. So, the difference between these two tires is 5 in terms of aspect ratio.

## What is the difference between 265 65 and 265 70 tires?

When considering the rim diameter of 265 65R17 and 265 70R17, we can see that both tires have the same rim diameter of 17 inches. As there is no difference in the rim diameter of these tires, any one of them would easily adjust a 17-inch rim.

## What does R mean on a 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. 17 The last dimension listed in the size is the diameter of the wheel rim, which is most often measured in inches.

## Can I use 245 tires instead of 235?

The quick answer is yes you can replace 245/50-18 tyres with 235/50-18 but they will have 10mm (0.4 in) smaller overall diameter. Will only slightly effect speedo and odometer – ie speedo will read about 1.5% high.

## Can I use 215 tires instead of 225?

Yes, you can. But only if the rims on your car can accommodate tires that are 10-20 millimeters wider. Bear in mind that wider wheels require more fuel due to their increased rolling resistance. Again, wider tires are more costly than narrower ones because they need more rubber during construction.

## What’s the difference between 275 55R20 and 275 65R20?

The first tire, which is 275 55R20 has an aspect ratio of 55. On the other hand, the tire 275 65R20 has an aspect ratio of 65. Hence, the difference in aspect ratio is 10. According to the aspect ratio, we can also tell the height of the first tire is 55% to its width.

## 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.

## Can you put a wider tire on the same rim?

As a general rule of thumb, it’s safe to fit a tire up to 20 millimeters wider than stock on the original rim. The actual width of the tire will vary depending on the width of the rim: The tire will expand 5 millimeters for every half inch (12.5 millimeters) increase in rim width.

## How much taller is a 235 tire than a 215?

Tire size. The tire size is the width in millimeters from the edge of one sidewall to the edge of the other sidewall. Therefore, a 235 tire is 20 millimeters wider than a 215 tire.

## What does the 40 mean on tire size?

40. This number means that your tire has an aspect ratio of 40%. In other words, your tire’s sidewall height (from the edge of the rim to the tire’s tread) is 40% of the width.

## What is a 45 series tire?

45 (Aspect Ratio): The tire’s sidewall is 45% of the tire’s width, which means the sidewall is about 114 millimeters or just over 4 inches. R (Construction Type): Radial tire, the most common type of tire produced today.

## How tall is a 40 series tire?

The 40 series wheels are 3.8″ tall and the maxx size wheels are 3.2″.

## Which tire is wider 245 or 265?

The 245 and 265 represent the width of the tire in millimeters. The main difference between 245 and 265 tires is the width. The 265 tire is wider at 10.43 inches, while the 245 tire converts to 9.65 inches.

Shopping Cart
Scroll to Top