RIMS AND VALVES

W and DW Rims

Drop centre rims

Divided rims/
flat base rims

Rims with 5° bead seats
and detachable flange

AG 15° drop centre rims

Tyres/Rims

Measuring
of Twin Wheels

 Valves

Wheels/Rims

Trelleborg Wheel Systems manufactures its own wheels and has a wide range of high quality rims.
A wheel consists of rim and disc with varying details like rim flange reinforcement and air valve guards depending on wheel application.

 

Wheel

The rim for a TWIN wheel is a one piece design and rolled with a profile to allow mounting of the tyre in the best possible way.
1=Rim
2=Disc with hubhole+bolthole
3=Rim flange
4=Reinforcement
5=Airvalve hole
6=Airvalve guard (pipesleeve)
7=Pipesleeve plug

 

 

Rim types

There are two existing main types of rim related to tyre bead seat angle.
5° - seat angle combined with high rim flange.
15° - seat angle combined with low rim flange.

 

Rim types can be identified by the rim diameter.
15° - rims with diameter ending with 0,5” (17.5”, 22.5”, 30.5” ....).
5° - rims with remaining diameters (24”, 34”, 38”.....).

 

 

 

Hump rim

Hump is a raised profile on the tyre bead seat, which holds the tyre firmely in place on its bead seat, even at low pressure.
Trelleborg 15° rims from diameter 22.5” up to 30.5” are equipped with humps.
1=Hump
2=Bead seat
3=Rim Flange

 

 

Rim edge reinforcement

TWIN wheels used for forestry and construction machines are often exposed to large mechanical stress and therefore the rim flanges need reinforcements. There are two different reinforcements: box type and round iron type.

 

Box type reinforcement                                                       Round iron reinforcement

 

 

Valve guards

TWIN rim can be equipped with different types of airvalve guards:
Standard for rims up to 26.5”.
Dual type for rims from 30.5”.
Pipesleeve with plugs on rims used for forestry and heavy duty operations.

 
Standard  Dual   Pipesleeve

 

 

Rim size

Measurements are always given in inches e.g. 16.00x22.5” and DW20Ax34”.
Rim width is standing in front of the “cross” 16.00 resp. DW20A.
The letters close to the rim width are a code for the rim contour. The rim diameter is stated after the “cross” 22.5 resp. 34..

 

 

 

Rim offset

Rim offset states the position for the disc hub contact surface related to the rim centreline.
0 = disc hub contact surface lined with centreline.
+ = disc hub contact surface lined outside centreline.
– = disc hub contact surface lined inside centreline.
An increasing (+) value for the offset gives a decreasing wheeltrack setting value and a decreasing (-) value gives increasing wheeltrack setting.

 

 

 

Hole pattern/Marking-Disc

To make it possible to fit a wheel on a hub, the disc must have a hole pattern matched to the wheel bolts and hub configuration.
A = Centre hole diameter
B = Pitch circle diameter
C = Stud hole (+stud hole design + N° of stud holes)
1 = Size designation
2 = Product code
3 = Manufacturer
4 = Date (month and year)


The centre hole diameter has in some cases tight tolerances. This when hub centering is used to fix the wheel in right position on the hub. This concept is combined with plain stud hole design.
The pitch circle diameter always has tight tolerances. This is also the case for the stud hole spacing (distance between the stud holes).
Stud hole designs are available with following alternatives:
1 = plain
2 = conical one sided
3 = conical double sided
4 = spherical one sided
5 = spherical double sided
It is important to clarify correct kind of stud hole design, otherwise there is an high risk of loose wheels and wheel damages.

 

 

 

Painting

All TWIN wheel rims are painted with a powder coating, giving a very high finish and durability. The wheels can be delivered in following basic colors: silver, white, red, yellow (construction type) ands yellow (John Deere type) as well as other special colors.

 

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