Rims

Rims can be divided into three main types:
 
  • One-piece rims
  • Two-part rims
  • Lock-ring rims.
At present, one-piece rims are most commonly used in passenger cars, vans and trucks driving on roads, as well as in forestry and agricultural work.
 
Two-piece rims are used in industrial and small machinery.
 
Lock-ring rims are used in earthmoving machines and harbour equipment.
 

Defective rims must be replaced

During operation, rims can become defective in many ways, for example, becoming warped or dented. One reason for rim defects can be overload. Always check the rim's condition when handling tyres.
 

Don't fix the rim – replace it

It is recommended that cracks appearing on the rim surface during operation should never be repaired by means of welding or honing. If you suspect that a rim has become defective, check it for cracks and, if necessary, replace it. Rims repaired by welding or other such methods will not endure in operation.
 

Mounting a tyre on rim

Before mounting a tyre onto the rim, you must make sure that the tyre and rim are compatible. At the same time, check the tyre and rim for any visible damage.
 
The mounting process contains the following steps: 
  • Replacing the valve and on multi-part rims, replacing the sealing ring (0-ring) (tubeless tyres); replacing the tube and, when necessary, the chafer (tube-type tyres)
  • Cleaning and checking the rim
  • Lubricating the bead area of the rim and tyre
  • Mounting the tyre
When working with lock-ring or two-part rims, you must make sure that the components are compatible and put together correctly.
 
Tyre mounting must always be done using appropriate tools that are in proper condition.
 
When should you discard a rim?
You must discard rims that have cracks, tears or deformation in the area that is in contact with the tyre.
 
When should you discard a tyre?
You must discard tyres with defects of such extent that they may impair the tyre structure or pressure endurance, e.g. defects in the body plies or belts.