You may be inclined to look at this tyre and say it is ok, but that would be ignoring 3 critical defects:
The tyre is down to the manufacturers wear bar and should be replaced. We often find that tyres like this have passed a WOF test because 75% of the tread was at the legal minimum of 1.5 mm, but this is not sufficient for safe driving margins in wet weather. 75% of this tyre might be barely 1.5 mm on the day of the WOF test, but will be below that very soon. No way will the tyre last till the next 12 month WOF!
On the left hand side the tread is worn down almost to the casing and is dangerous as hydroplaning and poor traction can result. The steel belts could be showing through the rubber very soon.
The third, and very serious defect, is the dry rot cracking on the tyres side wall which will be a consequence of either excessive age or exposure to sunlight or substandard tyre compound or possibly a combination of all 3. This tyre has the potential to “go out of round” and have balancing issues, for the tread to fly off or to have a sudden explosive and very loud blowout with the high possibility of loss of vehicle control at higher speeds.
Tyres like this may look ok at first glance, but are definitely not fit for purpose and need to be replaced as soon as possible. No way will they last “till the next WOF check”! The Campaign for Batter Tyres maintains that 12 monthly WOF checks are causing a reduction in tyre safety on New Zealand roads with dangerous tyres staying on vehicles longer. There is a strong case for reverting to 6 monthly Warrant of Fitness checks.