11:18. Wheels and tires
The S-class Mercedes models, depending on the equipment, are equipped with tires and wheels of various sizes. The size, along with rim width, determines also press fitting depth. Depth of a press fitting represents the size from the middle of a rim to a wheel niche prileganiye surface to a brake disk.
All disk wheels have the pressed ledge which at very sharp driving on turns prevents the rim pressure upon the tubeless tire.
If tires and / or ободья which are not specified in the passport of the car are installed, it is necessary to bring them in the passport. For this purpose, as a rule, permission to their use from Mercedes is necessary.
All data on pressure of air are provided for cold tires. The increase in pressure resulting from long driving in tires on 0,2 bars should not be pitted.
Air pressure in the tire of a spare wheel corresponds to the maximum pressure at full loading.
Prevention
Air pressure in tires is specified also in a sticker on a cover of the fuel tank.
Prevention
As winter tires provide restriction of speed, the driver has to know the instructions concerning admissible highest speed.
Marking of disks
Example: 6 J x 15 H2 ET31:
6 = wheel rim width in inches
J = alphabetic reference of height and contour of onboard gas station of a rim
x = designation of a one-piece rim with the deep basis
15 = diameter of a rim in inches
H2 = an external and internal profile of a rim with a ledge shoulder
ET31 = depth of a press fitting is 31 mm.
Marking of tires
Example:
/70 = height relation to width (height of cross section of the tire makes 70% of width)
If the specified ratios of cross section are absent (for example, 155R13), then in this case the "normal" ratio height/width takes place. It makes 82% for radial tires.
N = class of speed, N: to 210 km/h (for new tires it is specified not always).
R = a radial design (= the radial tire) 14 = diameter of a rim in inches
89 = an index of the bearing ability.
N = alphabetic reference of admissible highest speed.
Prevention
Alphabetic reference of speed
Alphabetic reference of speed costs after designation of the size of the tire. Symbols of designation of speed belong both to summer, and to winter tires.
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ALPHABETIC REFERENCE
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ADMISSIBLE HIGHEST SPEED
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Q
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160 km/h
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S
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180 km/h
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T
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190 km/h
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N
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210 km/h
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V
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240 km/h
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W
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270 km/h
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Date of production of tires
Date of production is specified on the tire in a code of the manufacturer.
Example: DOT CUL2 of UM8 064 TUBELESS
DOT = U.S. Department of Transportation
CU = the reduced designation of the manufacturer of tires
12 = size shinyum8 = tire design
064 = date of production = the 06th week 1994
= symbol of the current decade (1990 - 1999)
TUBELESS = the tubeless tire (TUBETYPE = the tire with the camera).
The sizes of wheels and tires/pressure of air in tires
| Model | Size of tires summer tires | Size of tires winter tires of M+S | Disk wheel (rim) | Pressure of tires in bar Half loading in front behind 2) | with 4 passengers in front behind 2) | ||
| C250D C180 C200 | 185/65R1588H 195/65R1591H 3) | 185/65 R15 88T 195/65 R15 91T | 6Jx15 H2 ET31 6,5Jx15 H2ET37 1) |
2,1
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2,3
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2,3
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2,8
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| 205/60R1591H | 205/60 R15 91T | 7Jx15 H2 ET42 7Jx15 H2ET37 1) | |||||
| C200D C220D | 185/65R1588T 195/65R1591H 3) | 185/65 R15 88T 195/65 R15 91T | 6Jx15 H2 ET31 6,5Jx15 H2ET37 1) |
2,1
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2,3
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2,3
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2,8
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| 205/60R1591H | 205/60 R15 91H | 7Jx15 H2 ET42 7Jx15 H2ET37 1) | |||||
| C220 C280 | 195/65R1591V | 195/65 R15 91T | 6Jx15 H2 ET31 6,5Jx15 H2ET37 1) |
2,1
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2,3
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2,3
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2,8
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| 205/60R1591V | 205/60 R15 91H | 7Jx15 H2 ET42 7Jx15 H2ET37 1) | |||||
1) Disks from light material
2) Cars with the sports chassis: + 0,2 bars
3) Tires of this size are mounted only on a rim of 61/2Jx15H2 ET37