Understand an MOT tyre tread-depth failure, where tread is measured and why tyre condition matters beyond the headline tread figure.
Tyres must meet the applicable legal tread requirements and also be free from serious structural defects. An MOT tread failure means the measured tyre does not satisfy the required standard for that vehicle and tyre type.
Tread channels help clear water from the contact patch. Low tread reduces wet-weather performance and increases aquaplaning risk.
A tyre can have acceptable tread in one area but still be unsafe because of uneven wear, cords exposed, bulges, cuts or other damage. Pressure and alignment can also contribute to abnormal wear.
Tread should be checked across the required portion of the tyre and around its circumference. If wear is uneven, investigate alignment, suspension or pressure rather than only fitting another tyre.
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Translate my MOTSee common MOT failures →AutoAid explains MOT wording in plain English, but the tester's recorded defect and a physical inspection take precedence.