Volkswagen Polo Service & Repair Manual: Tread Depth, Measuring
 Note
| When measuring tread depth, take measurements in the main
grooves. |
| Do not take measurements at the tread wear indicator. |
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| Tread depth of a tire must be measured in the main grooves
at the points showing the most wear. The positions of the tread
wear indicators are marked along the tire shoulder
-item 2-
→ Item. |
| In place of “TWI”, there may also be a “Δ” or “VW emblem”. |
| The TWI protrusions are 1.6 mm tall. This is the minimum
tread depth legally prescribed in Germany. |
| Different values may apply in other countries. |
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| Tread Wear Indicators (TWI) must not be included in the
measurement. The deepest point of the groove must be used for
the measurement. |
| A - |
Tread Wear Indicators in main grooves |
| B - |
Main grooves with Tread Wear Indicators
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Heel and Toe Wear
Tire Wear, One Sided