Mercedes Benz 2007 sl-class ユーザーズマニュアル

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. 

The tire width

1 (

page 302) indicates 

the nominal tire width in mm. 

The aspect ratio

2 (

page 302) is the 

dimensional 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. 

The tire code

3 (

page 302) indicates 

the tire construction type. The “R” stands 
for radial tire type. Letter “D” means diag-
onal 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” (

The rim diameter

4 (

page 302) is the 

diameter of the bead seat, not the 
diameter of the rim edge. Rim diameter is 
indicated in inches (in).

The tire load rating

5 (

page 302) is a 

numerical code associated with the 
maximum load a tire can support. 

For example, a load rating of 91 corre-
sponds to a maximum load of 1356 lbs 
(615 kg) the tire is designed to support. 
See also “Maximum tire load” 
(

page 308) where the maximum load as-

sociated with the load index is indicated in 
kilograms and lbs.