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Wheel change
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Tyres 1
Tyres 2


History of Wheels 1
History of Wheels 2
History of Wheels 3
History of Wheels 4
History of Wheels 5
History of Wheels 6

Tyre label
History Sec. Wheels
Winter Tyre
Snow Chains
All-weather Tyres
Where to mount new

Radial Ply Tyre
Cross-ply Tyre
Tyre fitting
Additional information
Wheel Balancing
Bus Wheel Balancing
Tyre Production 1
Tire Production 2
Wheel Load Limits
Roller Reststance 1
Emergency Running 1
Emergency Running 2
Tyre Press. Control 1
Tyre Control 2
Tyre Press. Control 3
Rims 1 -

Alloy Rim
Alloy Rim (production)
Rims 4 - forged
Low Cross-section
Drop-center Rim
Spoked wheel
Rim Hump
Rim (truck)
Emergency Wheel
Wheel Positions
Steering Offset
Steering axis incl.
Wheel Alignment
Relative Steering Angle
Obl./Side slip angle
Axle Alignment 1
Axle Alignment 2
Axle Alignment 3

Tyre Calculation
Inch -> mm
Axle Load Distrib.
Payload Distrib.
Roller Resistance 2

Wheels 2
Wheels 3
Wheels 4
Wheels 5
Wheels 6
Wheels 7
Wheels 8
Wheels 9
Wheels 10
Wheels 11
Wheels 12
Wheels 13


The wheel rim is constructed in such a way that the tyre can almost only be mounted by a machine. It keeps the (tubeless) tyre on its seat without losing air under all driving conditions. Modern wheel rims can contain emergency driving systems in the event of pressure loss.

The wheel rim bowl is connected with several screws to the wheel hub flange, or it is centrally bolted together, e.g., in racing vehicles. It is connected with the disc wheel which carries the tyre. To allow the assembly of a tyre, on the outdated triplex rim, the disc wheel is divided into three parts around the circumference, or has a deep bed or a one-sided removable rim flange. Two disc wheel halves are more seldom, they are provided with a sealing and are screwed together with the bowl. Standard nowadays, also in utility vehicles, (as a high-shoulder wheel-rim) is the one-piece drop-centre rim. In this case, the deep bed allows the mounting of tubeless tyres. A circumferential bead (hump) is mostly pressed into both sides of the deep bed, and prevents the tyre from slipping off and suddenly losing air even when high cornering forces occur.

Rim with widh and diameter8½Jx15 Lk 5x108x65 ET 38
Rim width in inches
JRim flange
xDrop-center rim
15Rim diameter in inches
5Number of wheel studs
108Diameter of the stud-hole circumference in mm
65Hub diameter in mm
38Rim-offset in mm

Important for the mounting is the stud-hole circumference. It is described through the centre of each stud-hole. Basically, the studs and the stud holes must correspond one hundred percent with each other. However, nowadays, there is the offset screwing, with which a difference of approx. 2 mm can possibly be compensated. In addition however, suitable centering rings (synthetic) are absolutely necessary to avoid off-centre imbalance. Alterations in the number of holes and/or larger stud-hole circumference differences can be compensated, perhaps, with so-called adaptor plates. However, in this case the correct length of the wheel bolts and the possible changing of the wheel-track must be taken into consideration. This can possibly be compensated by the choice of a different rim-offset. 12/09