VW Touran manuals

Volkswagen Touran Service Manual: Heel and Toe Wear

Heel-and-toe wear is step-like wear of individual tread blocks, due to which an increased rolling noise can develop. The heel-and-toe wear is caused by the uneven distortion of the tread blocks in the contact patch. Heel-and-toe wear appears in more extreme forms on non-tractive wheels than on tractive wheels. Refer to → Fig. ""Appearance of Heel-and-Toe Wear""
New tires have a stronger tendency to heel-and-toe wear, because the high tread blocks have greater elasticity. As tread depth decreases, the rigidity of the tread blocks increases and the tendency to heel-and-toe wear decreases.
   
Appearance of Heel-and-Toe Wear
A -  Tread blocks of a new tire; viewed in direction of travel -arrow 1-, tread blocks have the same height in front and rear.
B -  Heel-and-toe wear; viewed in direction of travel -arrow 1-, the tread blocks are higher in front than in rear -arrow 2-.
C -  Viewed in direction of travel -arrow 1-, tread blocks exhibit significant wear in forward area of "heel-and-toe wear"-arrow 3-.
Extreme heel-and-toe wear may lead to customer complaints about noise.
Increased heel-and-toe wear occurs with:
Toe values too great
Incorrect air pressure
Deep, open treads
Tires which are not mounted on the tractive axle
Extreme driving style around curves.
Non-Directional Tires
When heel-and-toe wear occurs, the direction of travel of the tire must be reversed. If increased heel-and-toe wear and rolling noise develop, the tires should be rotated diagonally. This leads to a reduction of heel-and-toe wear.
On vehicles with front wheel drive, this effect is increased by increased wear on front axle.
The rolling noise is somewhat louder immediately after rotating the wheels, but the normal noise level will be reached after traveling approximately 500 to 1,000 km (310.68 to 621.37 miles).
Directional Tires
In the event of increased heel-and-toe wear of the tires on the rear axle - most common with front-wheel drive - rotate the wheels from back to front. In the event of increased heel-and-toe wear on the outer edges on one axle, reverse both tires on their rims. Then the left wheel must be mounted on the right side and the right wheel on the left side.
  Heel and Toe Wear

High Speed Tires, Wear Characteristics

These tires are designed for the highest speeds. Good traction on wet roads is emphasized when developing these tires. Tread compounds do not have the abrasion resistance of tires for lower speeds, such as T and H tires.
Therefore the service life expectancy of high-speed tires is substantially lower under comparable operating conditions.
   
    Tire Service Life, Influences
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    Tread Depth, Measuring
      Note When measuring tread depth, take measurements in the main grooves. Do not take measurements at the tread wear indicat ...

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