Run-Flat Tires

Run-Flat Tires

Assembly Requirements

Warm up cold tires to the minimum mounting temperature

• This applies also to ultra high performance tires (height- / width ration smaller/same 45% and speed rating symbol larger than/same as V).

CAUTION!
Minimum mounting temperature for a tire may not be below 15 °C (59 °F) or above 30 °C (86 °F) in the center of the tire.

• For injury-free mounting, the upper sidewall and the upper bead inside must be minimum 15 °C (59 °F).

• The internal temperature is called the core temperature.

• Rubber is a poor heat conductor, and for this reason, a cold tire must exposed to a temperature controlled environment until the inner rubber layers have warmed up to at least 15 °C (59 °F).

• The tire surface temperature during the warm-up phase is not a measure the inside temperature.

• So that the cold tires warm up as quickly as possible, never stack them one on top of the other; store them separated from each other so that the warm air can circulate around them.

• Never us a room heater or a hot air gun to warm up tires because the surface temperature will heat up very quickly to a critical temperature.

• With the exception of using warm water or warm air (maximum 50 °C (122 °F)), there is no other way to warm up a tire without damaging it!

• If cold tires (below 0 °C (32 °F)) are brought into a warm room (above 0 °C (32 °F)), a layer of ice will start to form on the tires. This layer of ice means that humidity in the warm air is condensing on the tire.

• Once the layer of ice starts to melt, wipe up the water with a rag so that the warming up process will not be slowed down.

Warm-up time:

• If the room temperature is minimum 19 °C (66 °F) and the tire temperature is 0 °C (32 °F) 19 °C (32 °F) and higher, then the tires should be stored for at least 2 hours at a minimum room temperature of 19 °C (66 °F).

• If the room temperature is minimum 19 °C (66 °F) and the tire temperature is below 0 °C (32 °F), then the tires should be stored for at least 2.5 hours at a minimum room temperature of 19 °C (66 °F).

Recommendations:

• If possible, let the tires stand in the workshop for 1 day before mounting them.

• Store the tires as high as possible on an insulated surface, pallet or something similar.

• Position the tires so that they can be surrounded by the warm air.

• Wipe off the sweat

• Never heat the tires with a room heater or a hot air gun!

Tire, Pressing Off

CAUTION!
• Note the safety precautions. Refer to => [ Safety Precautions with Run-Flat Tires ] Service Precautions.

- Release air from tires, to do so remove the nickel-coated valve insert.

- When pressing off tire on a tire dismounting/mounting machine with press-off blade, always make sure that tire valve/tire pressure sensor - arrow - is located opposite the press-off blade - 1 -.





Press-off blade must be applied at maximum 2 cm removed from rim flange.

- Remove balancing weights and coarse dirt from disc wheel.

- Press off both tire beads around circumference while thoroughly applying tire mounting paste between tire and rim flange - arrow -.





Tires, Dismounting

CAUTION!
• Note the safety precautions. Refer to => [ Safety Precautions with Run-Flat Tires ] Service Precautions.

- Turn wheel on tire mounting device so that tire valve/tire pressure sensor - 2 - stands in front of mounting head - 1 -.





CAUTION!
Mounting head - 1 - must not be located in area - a - of tire valve/tire pressure sensor, otherwise the mounting head will damage the tire pressure sensor.

- Position mounting head - 1 - in vicinity of tire valve/tire pressure sensor so that tire iron can be put on approximately 30° next to tire valve/tire pressure sensor - 2 -.

- Install press holders - 3 - on disc wheel opposite the mounting head - 1 -.

- Now pry tire bead over mounting finger on mounting head using tire iron and remove tire iron again.

- Let the tire dismounting/mounting machine run clockwise until upper bead lies completely above the rim flange.





This slides the press holders - 1 - against the mounting head. This allows them to be removed again easily.

- Turn wheel on tire mounting device so that tire valve/tire pressure sensor - 2 - stands in front of mounting head - 1 -.





CAUTION!
Mounting head - 1 - must not be located in area - a - of tire valve/tire pressure sensor, otherwise the mounting head will damage the tire pressure sensor.

- Position mounting head - 1 - in vicinity of tire valve/tire pressure sensor so that tire iron can be put on approximately 30° next to tire valve/tire pressure sensor - 2 -.

- Now pry tire bead over mounting finger of mounting head using tire iron - 3 -.

- In addition, insert a plastic mounting lever - 4 -.

- Remove tire iron - 3 - again.

- Using plastic mounting lever - 1 -, hold bead in place over the rim flange from outside and let tire mounting device run clockwise until tire has been pulled off completely from disc wheel.





• Check tire pressure sensor for loose or damaged parts. If threaded connections are loose, union nut, valve insert, seal, sealing washer and valve cap must be replaced by new parts from repair kit.

• If tire pressure sensor is damaged, then it must be replaced completely. Refer to => [ Tire Pressure Sensor ] Service and Repair.

Tires, Mounting

CAUTION!
• Pay attention to the instructions for warming-up cold tires to the minimum mounting temperature

• Note the safety precautions. Refer to => [ Safety Precautions with Run-Flat Tires ] Service Precautions

- Coat rim flanges, tire beads and inside of upper tire beads thoroughly with tire mounting paste.

- Turn disc wheel on tire mounting device so that tire valve/tire pressure sensor - 1 - stands on opposite side of mounting head - 2 -.





- Let the tire dismounting/mounting machine run clockwise.

- Mounting of the lower bead ends before the tire valve/tire pressure sensor - arrow - to prevent damage to tire pressure sensor.





Tire bead now slips over the rim flange. Wheel may be turned only as far until mounting head is located just in front of tire valve/tire pressure sensor - arrow -.

- Turn disc wheel on tire mounting device so that tire valve/tire pressure sensor - 1 - stands on opposite side of mounting head - 2 -.





- Install press holders - 3 - on disc wheel.

- Make sure tire bead fits correctly on mounting head and let mounting device run clockwise.

- Mounting of the upper bead ends before the tire valve/tire pressure sensor - arrow - to prevent damage to tire pressure sensor.





Tire bead now slips over the rim flange. Wheel may be turned only as far until mounting head is located just in front of tire valve/tire pressure sensor - arrow -.

- Remove press holders from rim flange.

- Inflate tire to an inflation pressure of max. 3.3 bar (spring pressure).

CAUTION!
If tire beads do not make contact completely on disc wheel edge, pressure must not be increased under any circumstances.

Pre-damage to tire or disc wheel would result.

- If tire beads do not make contact completely on disc wheel edge, then release air, press off tire bead once more and coat rim flange thoroughly again with tire mounting paste.

- Inflate tire to an inflation pressure of max. 3.3 bar (spring pressure).

- If tire beads make contact on bead seat without problems, then increase inflation pressure to 4 bar to settle tire.

- Install a new nickel-plated valve insert and fill the tire to the specified pressure.

- Then balance wheel.

- Mount the wheel and tighten it to tightening specification. Refer to => [ Wheel Bolt Tightening Specification ] Specifications.