Rear Tyre Type - PTW
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PTW rear tyre tread type.
Specify the PTW front tyre type.
(OECD RS9/TEG/ 151 definitions)
The following tread type descriptions may be used as a guideline to determine tread type.
- Slick (no tread pattern)
The tyre has no specific tread pattern (see Figure 1).
Figure 1. No tread pattern, slick
- Straight Ribbed
The tire tread pattern is perpendicular to the axis of rotation of the tire (i.e. the tread pattern is parallel to the direction of rotation of the tire).
There may be a slight offset in the rib pattern as well (see Figure 2).
Figure 2. Straight rib tread pattern with offset
- Raised Block (trials type)
The tread pattern is similar to the knobby pattern, however, there is closer knob spacing and the tire is approved for street use.
The tire tread pattern is parallel to the axis of rotation of the tire (see Figure 3).
Figure 3. Trials type tyre tread
- Off Road (knobby tyre)
The tire tread is raised and consists of individual knob-like raised areas, primarily designed for improved traction under off-road conditions (see Figure 4).
Figure 4. Knobby tyre treads
- All Weather (cross or dog bone pattern)
The tire tread has interlocking tread components (dog bone shape, flag shape, etc.) which may be either parallel to the axis of rotation of the tire and/or perpendicular to the axis of rotation of the tire. All weather diagonal or diamond pattern The tire tread pattern forms a closed diamond pattern or a closed diagonal pattern (see Figure 5).
Figure 5. All weather, diagonal tread type
- All Weather (angle groove)
The tire tread pattern has an angle groove pattern which originates at the center of the tire tread and radiates on an angle to the edge of the tire tread (see Figure 6).
Figure 6. All weather, angle groove tread type
- Racing Design (minimum groove design)
There is a very shallow tread pattern on the tire. These tires are very similar to the slick tires described above yet they have a slight tread pattern on them when compared to the all weather tires (see Figure 7).
Figure 7. Racing design tyre tread