minimum tread depth nz

The vehicles steering or suspension geometry may need to be checked. This means when conditions are wet older tyres can increase the time it takes for your car to come to a stop.

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Or call us with your query on 0800 896 500.

. For example while tyres on your vehicle may pass on the day of your warrant inspection youll need to replace them as soon as the tread gets to the minimum depth. Or call us with your query on 0800 896 500. If you can replace your tyres at 3mm of tread depth.

In wet weather tyre tread grooves help to remove water from the contact patch between your tyres and the road surface meaning your car can brake. Analysis of stairway related accidents shows that overstepping of treads is a common cause of accidents. The minimum legal tread depth limit is 15 mm for car and van tyres.

There is a substantial drop in wet breaking performance under 3mm of tread depth. The legal minimum in NZ and Australia is 15mm. 300 13 3900 mm Each tread will also have a 20 mm projection giving a total tread depth of 320 mm but the projection does not add.

Minimum permitted tread depth is 280 mm but with ample space for the stairs 300 mm treads have been selected. Adequate tread depth is essential for stairway safety. Virtually all tyres have moulded tread depth indicators.

The minimum legal tread depth is 15mm within all principal grooves that contain these moulded tread depth indicators. Most stairs are between 900mm 1100mm wide for comfortable use. Riser height and tread depth should be of a uniform height within a tolerance of 5mm in one flight.

The legal minimum tread depth for cars in the UK is 16mm throughout a continuous band comprising the central three-quarters of breadth of the tread and around its entire outer circumference. At least 16mm throughout a continuous band in the centre 34 of the tread and around the entire circumference of the tyre. Of course while the legal minimum is 15mm the more tread you have the better grip your tyres will have and the safer you will be so it makes sense to check them regularly.

So if your tyres are at an already dangerous but WOF passable tread depth and the time between WOF inspections has doubled it is fair to assume those who rely on the WOF to check tyre safety may very well find themselves driving below the legal. The wear bars show when you only have 15mm of tread left at which point your tyres are on their absolute minimum legal tread depth. LEGAL MINIMUM TREAD DEPTH.

In the UK it is 16mm. Almost 90 of all New Zealandns do not know the legally required minimum tread depth of 15 mm. Ensure tyres have adequate tread depth.

Principal grooves are the wide grooves in the tyre tread which have the tread-depth indicators located inside. For safety reasons it is recommended that you replace your car tyres before the legal limit is reached. The rule now states that a tyre must have a tread pattern depth of at least 15 mm excluding any tie-bar or tread depth indicator strip within all principal grooves that contain moulded tread depth indicators and around the whole circumference of the tyre.

In the wet or travelling at high speeds your grip and stopping distances are seriously compromised if you have below 15mm of tread. These must be at least 15mm around the whole circumference of the tyre. There is currently no specified minimum width in the Building Code.

Some studies have shown that going from 3mm to 15mm results in a 25 reduction in wet weather braking performance. Legally you are required to replace your tyres when your tread depth wears below 16mm however we recommend maintaining a tread depth of at least 3mm to avoid a reduction in tyre capability. Multiply the tread depth by the number of treads to calculate the overall length of the stair.

What are principal grooves and tread depth indicators and how do I find these. You can check current stair regulations in full here PDF. Minimum tread depth nz Thursday February 24 2022 Edit.

Another easy check is to insert a 20c coin into the tread. Furthermore people dont know that this is not the tyre recommended minimum depth of. What are principal grooves and tread depth indicators and how do I find these.

The legal minimum tyre tread depth varies by each type of vehicle. However a small number of tyres such as some retreaded or vintage tyres may not have moulded tread-depth indicators. As your tyres tread wears their ability to disperse water reduces.

Most tyres have moulded tread-depth indicators which are flush with the tyre tread when it has reached the minimum depth. These must be at least 15mm around the whole circumference of the tyre. The minimum tread depth of 15mm in NZ is too low and there have been calls for it to be raised.

Principal grooves are the wide grooves in the tyre tread which have the tread-depth indicators located inside. These must be at least 15mm around the whole circumference of the tyre. That means one in three New Zealandns is driving under illegal unsafe tyre conditions.

The IBC maximum rise of a single stair flight is 12. Tyres showing wear on one side or showing feathered edges to the tread pattern are often indicative of mechanical maladjustment. At least 10mm throughout a continuous band across at least 34 of the breadth of the tread and around the entire circumference.

The OSHA standard for rise and run of stairs is maximum 95 rise and minimum 95 run tread depth. Almost 90 of all New Zealandns do not know the legally required minimum tread depth of 15 mm. The legal limit for minimum depth of the tread on your tyres is 16 millimetres across the central ¾ of the tread around the complete circumference of the tyre.

The minimum legal tread depth is 15mm within all principal grooves that contain these moulded tread depth indicators. The 2018 IBC building code for rise and run of stairs is a maximum 7 rise and minimum 11 run tread depth. The minimum legal tread depth is 15mm within all principal grooves that contain these moulded tread depth indicators.

In subscribing to our newsletter by entering your email address you confirm you are over the age of 18 or have obtained your. If your tyres are worn to the tread wear indicators TWI 16mm or below they must be replaced. The likelihood of an overstep decreases significantly with increasing tread depth.

Guidance For Vehicle Inspectors When Checking Tyre Tread Depth Nzta Vehicle Portal