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Unilateral wear > < Tyres with uniform wear

Polo Mk4

Measuring track depth
Measuring track depth
  Note
t  The main track splines are the measuring points to determine the track depth.
t  Do not measure in the TWI (Tread Wear Indicator - means: Tread Wear Indicator).
   
The track depth must be measured in the main splines at the points of worse tyre wear. The positions of the TWI indicators are visible on the tyre shoulder → Item.
Instead of the „TWI“ there may be a „Δ“ or the manufacturer's „symbol“.
The TWI saliences are 1.6 mm high. This is the minimum surface track depth allowed by law.
In other countries values may differ.
  N44-0238
TWI indicators may not be included in the measurements. The measure obtained at the lowest point of the surface spline is determinant for the measurement value.
A - TWI indicators at the main surface splines.
B - Main surface splines with TWI indicators -arrows-
  N44-10172

Unilateral wear > < Tyres with uniform wear