| The contractions are small cavities on the tyre's side
tread. |
| They extend from tyre bead to tyre shoulder. The figure shows
the referred components → Fig.. |
| It is a super elevation of material in the composition of
tyre components. |
| The contractions do not exert any influence related to: |
| t
| other features of the tyre. |
| The contractions can present different intensities. It is
not required the removal of the tyre from the wheel or performing
an inspection. |
| What is the cause of contraction's build-up? |
| By reason of weight, the modern tyres with interlaced steel
wire mesh are made mainly with a side wall of only one layer. |
| The components of side wall are formed by elongated bands
before being matched in a tyre. These bands shall get overlaid in
the combination of material. It produces small irregularities/waves
in the overlaid component zone. Due to the single layer's structure,
these overlaying are slightly visible up from the exterior. |
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