Mercedes-Benz 2009 M-Class Operator's Manual page 261

Manufacturer
5
Tire ply material ( Y page 265)
6
Tire size designation, load and speed
7
rating ( Y page 259)
Load identification ( Y page 262)
8
Tire name
9
i For illustration purposes only. Actual data
on tires are specific to each vehicle and
may vary from data shown in above
illustration.
For more information, see "Rims and
tires" ( Y page 401).
Tire size designation, load and speed
rating
Tire width
1
Aspect ratio in %
2
Radial tire code
3
Rim diameter
4
Tire load rating
5
Tire speed rating
6
i For illustration purposes only. Actual data
on tires are specific to each vehicle and
may vary from data shown in above
illustration.
General: Depending on the design standards
used, the tire size molded into the sidewall
may have no letter or a letter preceding the
tire size designation.
No letter preceding the size designation (as
illustrated above): Passenger car tire based
on European design standards.
Letter "P" preceding the size designation:
Passenger car tire based on U.S. design
standards.
Letter "LT" preceding the size designation:
Light Truck tire based on U.S. design
standards.
Letter "T" preceding the size designation:
Temporary spare tires which are high
pressure compact spares designed for
temporary emergency use only.
Tires and wheels
Tire width
Tire width indicates the nominal tire width
1
in millimeters.
Aspect ratio
Aspect ratio is the dimensional
2
relationship between tire section height and
section width and is expressed in percentage.
The aspect ratio is arrived at by dividing
section height by section width.
Tire code
Tire code indicates the tire construction
3
type. The "R" stands for radial tire type. Letter
"D" means diagonal or bias ply construction;
letter "B" means belted-bias ply construction.
At the tire manufacturer's option, any tire
with a speed capability above 149 mph
(240 km/h) can include a "ZR" in the size
designation (for example: 245/40 ZR 18). For
additional information, see "Tire speed
rating" ( Y page 260).
Rim diameter
Rim diameter is the diameter of the bead
4
seat, not the diameter of the rim edge. The
rim diameter is indicated in inches (in).
Operation
Z
259