- 6 or 7: rim width in inches, measured between the flanges of the rim flange, transverse to the direction of rotation of the wheel.
- J: bead height designation, x: deep rim designation.
- 15: rim diameter in inches, measured bead to bead (tire diameter)
- ET 45: wheel pressing depth 45 mm. This size is more clear from the figure above.
- H2: designation of a deep wheel with annular belts on the landing shelves. Two lugs inside at the base of the rim under side load (hard cornering with low tire pressure) do not allow the tire beads to come off the bead.
These standard designations only indicate the main dimensions of the tire, but not specific data for each vehicle, such as the number of holes for fastening the wheel or the diameter of these holes.
Wheel bolts and wheels - one unit
Structurally, wheel bolts and wheels are a single unit and therefore cannot be used separately. The tapered fit on the wheel mounting holes is precisely matched to the cones of the wheel bolts. Other cone shapes cannot guarantee secure fastening of the bolt and thus the wheel.
For rims installed and approved for use in the Audi-100 (steel and light alloy) only the so-called crown head bolt can be used (part number 431 601 139 A). It can be recognized by the special recesses at the top of the bolt head.
For rims purchased from a parts store, different rules apply. Perhaps you should buy wheel bolts from the appropriate manufacturer!
Wheels for winter tires
Winter tires should be bought immediately with suitable steel rims. Although this is more expensive at the first moment, it will save money when overboarding. It is not uncommon for tire shops to sell complete sets at a bargain ppic. For winter tires, standard 6 J x 15 wheels will fit. You can also purchase used wheels.
Light-alloy wheels under the influence of road salt can corrode to the point of complete unsuitability. Damage to the protective varnish covering them should therefore be repaired as soon as possible. Those who use light-alloy wheels in winter should check their condition every time they wash their car.
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