2018 Mercedes-Benz S65 AMG Tire Size

The original tire size for your 2018 Mercedes-Benz S65 AMG is listed below. Tap on the box to view a color-coded explanation of the best Mercedes-Benz S65 AMG tire size.

255/40ZR20/XL (101Y)(Front)

Simplified Size:  255-40-20

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Mercedes-Benz S65 AMG is 255/40ZR20/XL (101Y) (Front).  A color-coded explanation of the 2018 Mercedes-Benz S65 AMG's tire size is shown below.

255

This number indicates that your tire has a width of 255 millimeters.

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.  In this case, the sidewall height works out to be 102 millimeters.

Z

This tire has a speed class of Z, which means it's part of an elite speed class of 149 mph or more (240 km/h).  A tire's speed class is less specific than the speed rating.

R

This letter denotes how your tire was constructed.  Radial is the standard construction method for about 99% of all tires sold today.

RRadial
BBias Belt
DDiagonal
20

The tire size was designed to fit rims or wheels that are 20 inches in diameter.

XL

The mark of XL means extra load.  A tire with this designation can handle higher inflation pressures than a regular tire, which increases its maximum load.

101

This tire has a load index of 101, which means it's capable of carrying a load of 1815 pounds (825 kg) or less.  A higher number means the tire can carry more weight.  A lower number means the opposite.

Y

This tire has a speed rating of Y, which means 186 mph (300 km/h) is the maximum speed that can be sustained for 10 minutes.  A higher speed becomes dangerous.

285/35ZR20/XL (104Y)(Rear)

Simplified Size:  285-35-20

Simplified size is useful for shopping and buying tires.

The original tire size for your 2018 Mercedes-Benz S65 AMG is 255/40ZR20/XL (101Y) (Front).  A color-coded explanation of the 2018 Mercedes-Benz S65 AMG's tire size is shown below.

285

This number indicates that your tire has a width of 285 millimeters.

35

This number means that your tire has an aspect ratio of 35%.  In other words, your tire's sidewall height (from the edge of the rim to the tire's tread) is 35% of the width.  In this case, the sidewall height works out to be 99 millimeters.

Z

This tire has a speed class of Z, which means it's part of an elite speed class of 149 mph or more (240 km/h).  A tire's speed class is less specific than the speed rating.

R

This letter denotes how your tire was constructed.  Radial is the standard construction method for about 99% of all tires sold today.

RRadial
BBias Belt
DDiagonal
20

The tire size was designed to fit rims or wheels that are 20 inches in diameter.

XL

The mark of XL means extra load.  A tire with this designation can handle higher inflation pressures than a regular tire, which increases its maximum load.

104

This tire has a load index of 104, which means it's capable of carrying a load of 1980 pounds (900 kg) or less.  A higher number means the tire can carry more weight.  A lower number means the opposite.

Y

This tire has a speed rating of Y, which means 186 mph (300 km/h) is the maximum speed that can be sustained for 10 minutes.  A higher speed becomes dangerous.