1 BMW depending on model and equipment can have tyres and disks of the various sizes. All disks have depth запрессовки 45 mm. Depth запрессовки is a distance from the middle of a rim to a persistent surface of a wheel on a brake disk or a drum.
Bolts of a wheel for steel and легкосплавных disks have the identical sizes.
At installation легкосплавных disks of other manufacturers bolts of other sizes can be demanded.
The technics constantly develops. Can be so that for older models other values of pressure in tyres are admissible. The sizes specified in documents to the car are defining.
2 At a sports manner of driving it is recommended to increase pressure in forward and back tyres by 0.2 bar. At pressure increase it is necessary to start with a base-line value for various conditions of loading.
3 Winter tyres as a rule have pressure upon 0.2 bar above than summer. It is necessary to consider recommendations of manufacturers of winter tyres.
4 As winter tyres have restriction on speed, in sight of the driver the tablet with instructions of the maximum speed should be strengthened.
Designation of disks
Example 6 J x 15:
6 width of a rim in inches.
J a letter designation of height and a contour onboard закраины rims.
х a designation of a unicomponent deep rim.
15 diameter of a disk in inches.
BMW it can be equipped with tyres and disks of the various sizes. However use of disks with depth запрессовки only 45 mm is supposed. Depth запрессовки is a distance from the middle of a rim to a persistent surface of a wheel on a brake disk or a drum.
Admissible lateral palpation on onboard закраине rims: 1.2 mm.
Admissible vertical palpation on a landing shelf of a rim: 0.8 mm.
Designation of tyres
Example: 195/70 R14 89H
195 width of the tyre in mm.
/70 the relation of height to width (the height of cross-section section of the tyre makes 70 % from width).
If отельные data on the relation of width to height are absent (for example, 175 R 14), means it is a question of "the normal" relation. It makes 82 %.
R a radial design.
14 size of a rim in inches.
89 parametre of load-carrying capacity.
Н a class of speed, Н: to 210 km/h (on new tyres it is resulted not always).
If between the data 14 and 89 there is designation M+S, it is a question of tyres with a winter protector.
The letter of speed stands up for in the size of the tyre. Symbols of speed concern both to summer, and winter tyres, address to Specifications.
Date of manufacturing of the tyre
Date of manufacturing of the tyre is specified on the tyre in a code of the manufacturer
DOT CUL2 UM8 019 TUBELESS
DOT Departament of Transporation (the Ministry of Transport of the USA).
CU reduction of the name of the manufacturer.
L2 The size of the tyre.
UM8 Tyre execution.
01 date of manufacturing - 01st working week 1999.
TUBELESS бескамерная (TUBETYPE - the tyre with the chamber).
5 Regular check of a condition of tyres will allow you to avoid the troubles connected with stops in a way because of the lowered wheel. Besides, such checks give the valuable information on possible problems with a steering and a suspension bracket before occurrence in them of serious damages.
6 Tyres are equipped by the built in strips of indication of deterioration of a protector which are bared at decrease in depth of a protector to 1.6 mm then tyres are considered worn out. This size represents is minimum admissible depth of a protector; the tyres, which depth of a protector of 2 mm and less in most cases is recommended to replace. Depth of a protector also can be defined by means of the simple and inexpensive adaptation known under the name of a measuring instrument of depth of a protector.
7 Pay attention to any unusual deterioration of protectors. Such defects of a protector as cavities, cambers, уплощения and stronger deterioration on the one hand specify in infringement of corners of installation of forward wheels and-or wheel balancing. At revealing any of the listed defects it is necessary to address for their updating in шиномонтажную a workshop.
8 Carefully check the tyre on presence of cuts, punctures and got stuck nails or buttons. Sometimes after протыкания tyres a nail it still some time holds pressure or lowers very slowly.
At suspicion on presence such “a slow puncture” at first check up tightness of a nipple of the gate of a rating. Then examine a protector on presence at it got stuck strangers of subjects or the punctures closed up earlier which has started over again to pass air. If there is a suspicion that there is a puncture, to make sure of its presence it is possible, having moistened a suspected site with soap water. In the presence of leak the solution will start to bubble. If not too big, the tyre it is usually possible to repair a puncture in any шиномонтажной a workshop.
9 Carefully examine internal lateral surfaces of tyres on presence on them of signs of leak of a brake liquid. If those are available, immediately check up brake system.
10 Maintenance in tyres of correct pressure increases term of their service, helps to save fuel and improves comfort of movement. The special manometre is necessary for pressure check.
Always hold an exact manometre in the ware box. Indications of the manometres which have been built in nozzles of air hoses at stations of service, often happen inexact.
11 Always check pressure upon cold tyres (i.e. to a trip on the car). If to check pressure on warm or разогретых tyres, it will lead to overestimate of indications of a manometre because of thermal expansion of tyres. In this case never it is necessary to lower pressure since after cooling of the tyre it will appear below norm.
12 Screw together a protective cap from the gate of a rating acting from a disk of a wheel or from a cap of a nave, then densely press to the gate a manometre nozzle. Consider instrument readings and compare them with recommended in Specifications. Do not forget to establish into place a protective cap for hit prevention in the mechanism of a nipple of a dirt and a moisture. Check up pressure in all four tyres and if necessary pump up them to the recommended value of pressure.
13 do not forget to support demanded pressure and in a spare wheel.
Check of pressure of air in tyres
14 Check of pressure of air should be spent only on cold tyres.
15 Turn away a gate cap.
16 Pressure of air in tyres is checked once a month, and also at service carrying out (including spare a wheel).
17 Besides, pressure of air are necessary for checking before each long trip since temperature loading on tyres in this case increases.
18 air Necessary pressure in tyres are resulted on a label which is on an inside of a cover of a fuel tank.
At application of winter tyres pressure of air should be increased by 0.2 bar in relation to the established value.
19 Pressure of air of narrow tyres of a spare wheel is specified on боковине a disk.
20 Car can be equipped by the pressure monitoring system in tyres (RDC - Reifen-Druck-Control). The system observes of pressure of air, both on the motionless car, and at movement and considers thus speed and external temperature. For this purpose in each wheel, including spare, the transferring block with the gauge of pressure and temperatures which eats from литиевой batteries with service life five years is established. The transmitter transmits a signal to the reception aerial in an arch of a wheel which is connected with the onboard processor. Thanks to presence RDC dangerous ruptures of tyres which arise owing to work of deformation of the tyre as consequence of low pressure of air, in particular, can be excluded.
Check of the gate of tyres
Applied extension pieces of gates should be checked up on presence of damages and the pollution conducting to негерметичности. If necessary it is necessary to replace extension pieces.
21 Turn away a protective cap and the extension piece.
22 Put on the gate a small amount of a soap solution or a saliva. If the air vial is formed, tighten an insert 3 protective cap 2.
It is necessary to apply to gate pulling up only a protective cap 2. 1 rubber protective cap, 4 gate.
23 Again check up the gate. If there are vials and the gate it is not possible to tighten, it it is necessary to replace (work HUNDRED).
24 necessarily again establish into place a protective cap.