Information on tires/rims - AH40.10-P-9411-01RT

MODEL 251 

Tires 

For service conversions, the tire/disk wheel specifications and dimensions should be compared with the entries in the registration papers.

When assembling tires a specific assignment of tires and disk wheel (matching) is necessary so that the smooth operation of the wheel is guaranteed.

The symbols for alignment points are found on:

• Tires with a colored dot on the outboard side of the tire
• Light alloy disk wheel generally at the valve hole, in addition mark with a color dot.

Always replace the rubber valve.

Damaged and defective tires must always be replaced. The repair methods employed in the tire trade are not approved by Mercedes-Benz. Small nicks (< 0.8 mm) on the side wall of the tire do not usually pose a cause for concern, and continued use of such tires is approved.

Only use tires listed in the valid Service Information bulletins and repair instructions.

If the maximum permissible speed of an M+S tire is lower than the maximum speed of the vehicle, an appropriate warning sticker must be affixed within the driver's field of view.

Tires approved for higher speeds may be used.

Always provide all disk wheels with tires of the same construction, same make and same design. Avoid combining winter tires (M+S) with summer tires.

Run in new tires for approx. 100 km at moderate speed.

Unidirectional tires must be installed according to the arrow on the side wall of the tire.

Tires are subject to an aging process with negative effects on the properties of the tire. In order to ensure optimum effectiveness in winter, M+S tires should not be used for longer than 3 years.

Tire pressure 

Excessively low tire pressure increases the rolling resistance and increases flexing of the tire. This causes the critical temperature limit to be exceeded (carcass detachment) and destroys the tire. Respond to loss of tire pressure by determining the source and replacing the tire as indicated.

Cleaning 

The use of high-pressure cleaners with round jet nozzles to clean the wheels can lead to tire damage. Such damage occurs especially on the tire side walls. The following should be observed when using flat jet nozzles:

Maintain a minimum distance of 300 mm

Do not direct the water jet at a single point on the surface of the tire for any length of time.

Mounting 

Before putting into storage, clean tires thoroughly and check for damage and adequate tread depth. Mark the position and running direction of the tires with chalk. Do not store tires outdoors. Under the influence of sunlight, heat, moving air and ozone the rubber looses elasticity and strength, ages more quickly and becomes cracked. Storage areas should be dry, cool and dark. Avoid drafts by keeping doors and windows closed as much as possible. Do not bring tires into contact with gasoline, oil or other greases as they dissolve the rubber.

Disposal 

Collection, storage and disposal should be performed in accordance with the legal requirements and the company's own regulations.

Disk wheels 

Only use approved Mercedes-Benz rims of the same version.

The wheel bolts should generally be tightened to the specified tightening torque using a torque wrench. Retightening of the wheel bolts after approx. 100 to 500 km is not required.

The seat for the tire bead must display no corrosion pits.

Before installing a new rubber valve, clean the contact surfaces on the rim.

Damaged or deformed disk wheels must not be repaired.

Tire pressure monitor 

Before replacing a tire, check the date of manufacture of the TPM wheel sensor: TPM wheel sensors which are more than 5 years old must be replaced.

• Read out the actual values of the tire pressure monitor using STAR DIAGNOSIS

Read out. Check the remaining life of the TPM wheel sensor battery and replace the TPM wheel sensor if necessary.