A
Manufacturer
B Tire ply material ( Y page 139)
C Tire size designation, load and speed
rating (Y page 136)
D Load identification (Y page 138)
E Tire name
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 217).
Tire size designation, load and speed
rating :
Tire width
; Aspect ratio in %
= Radial tire code
? Rim diameter
A Tire load rating
B Tire speed rating
i For information 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.
Tire width
Tire width : indicates the nominal tire
width in mm.
Aspect ratio
Aspect ratio ; is the dimensional
relationship between tire section height
and section width and is expressed as a
percentage. The aspect ratio is arrived at
by dividing section height by section
width.
Tire code
Tire code = indicates the tire
construction 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 137).
Rim diameter
Rim diameter ? is the diameter of the
bead seat, not the diameter of the rim edge.
Rim diameter is indicated in inches (in). 136
Tires and wheels
>> Operation.
