The reason - in the increased heating and an adverse form of a spot of contact. Similarly wear increases and at an elevated pressure in the tire, however, not on extreme paths any more, and in an average zone of a running surface. On schedule 1 the reduction of run of the tire caused by the wrong pressure is shown.
However, having made a reservation above, what we are going to go that is called "here", we will take into account and "tutoshny features of roads. Having made it, we will see that advantages of a wide wheel "at us" are not so obvious.
The first indicates width of a profile "B" (as well as family of tires). Width of a profile is purely constructive size of the tire, measured on smooth sidewalls on the tire. For operation the dimensional width "in" considering thickness of assembly corbels, decorative corbels and inscriptions on the tire is more important, it can exceed size "B" approximately for 6%. Width of the tire installed on a rim with other width of a profile (but admissible under the terms of operation), it is possible to define approximately by addition or subtraction 5 mm on each 1/2 inches of increase or reduction of width of a profile of a rim.
The second - the relation of height of a profile "H" to its width "In" specified as a percentage (a so-called series of the tire), - in our example the tire of the 70 series. If the second is absent, data on width indicate H/B = 82, i.e. the tire of the 82 series (so-called fully profile tires. In all other cases the ratio of a profile has to be specified.
Asymmetric tires. At installation of tires with asymmetric drawing it is necessary to focus tire sidewalls correctly. In this case the internal sidewall is designated by words: "SIDE FACING INWARDS" - the party turned inside (or "INSIDE").
Focusing attention on quality further, it is possible to note that now on VAZ the so-called cleared technology is applied. Earlier all marriage was shoveled at plant. If, let us assume, when profiling the rim tore - right there podvarivat the welding machine, smoothed out and started back in technology (the same and with mechanical defects and microcracks). All this took away time a great lot. Now wheels with defects are rejected and then transferred to subsidiary where they also are led up to standard.
To quality of products as it everywhere is accepted on VAZ, the closest attention is paid. Control is exercised on all operations, since welding of the feedwell when the welder controls it after profiling on existence of microcracks and other defects. Further after production of a "black" wheel - automatic control of all without exception of wheels on a face beating and selective - on radial. (Now on one of lines modernization then control both on face, and on a radial beating will be exercised is carried out.) Then absolute visual control. For prevention of an exit of marriage about balancing and balancing cars every morning pass certification. Before change banish a wheel by balancing car and then put it on the control stand. If balancing in norm - begins work.
Diagonal tires and radial tires which gained now exclusive distribution with a steel cord have so various properties that the mixed installation of tires on the car is forbidden in any option.
Besides, if to try to look as there "at them", it is possible to take experience of the same Germany where again come back covering wheels with powder. However not that powder that is applied on VAZ where, as we know, powder on an epoxy basis is used. In the world the mass of powders is acquired for today. One of them - on a polyurethane basis. A lack of an epoxy covering of its fragility - a film thickness. 100 microns at blow are chopped off. The polyurethane covering more elastic - at blow is rumpled, without being chopped off.
TWI (TREAD WEAR INDICATOR) - a mark of residual height of drawing of a protector (the indicator of wear of the tire). According to the international requirements it is necessary to make in due time replacement of worn-out tires, and it is best of all to do it before achievement of a mark of residual height of drawing of a protector, equal 1,6 mm.
Shortcomings - the big cost, the bigger demanded space, and also reduction of limit angles of rotation of wheels that the bigger space for placement of a spare wheel, some deterioration of smoothness of the course, the increased air resistance, less favorable winter qualities, the increased tendency to hydroplaning is connected with increase in radius of turn, already at average degree of wear, a smaller resource, increase in effort on a steering wheel (in the absence of the amplifier).