"Tyre tread,Tread depth"
"DO I NEED NEW TYRES? HOW TO CHECK YOUR TYRE TREAD"
[ "Itƒ??s all too easy to become complacent about the safety of your car, but the tread depth of your tyres is not something you want to ignore. Driving in the wet, your tyres may have to disperse up to 9 litres of water a second when travelling at 100km/h. Their ability to do this comes down to their tread; too worn, and the water becomes sandwiched between the rubber and the road, and thatƒ??s when all grip disappears.

Fortunately, checking tread depth on your tyres is a simple process.

First, some numbers.

New tyres typically have 8-10mm tread depth
Bald tyres have 0mm tread depth
Tyre manufacturers recommended that you replace tyres that have worn to 3mm because below that, the performance is compromised, especially in wet conditions
Once your tyres wear to 1.6mm tread depth, they are unroadworthy
There are two methods for checking tyre tread depth.
All tyres come with what is called treadwear indicator bars. They are raised bumps of rubber located in the tread grooves of your tyres. When these bars are flush with the walls of the tread, it means your tread is at a depth of 1.6mm, and the tyre needs replacing. The drawback of indicator bars is that there is no accurate way of measuring how much tread is left if the bars are still sitting below the tread walls.
The best way of measuring tread depth is with a treadwear gauge. This simple and handy tool measures the tread depth of your tyres in millimetres, so you know how much tread remains and, therefore, how much life your tyres have.
Itƒ??s important to know the depth of your tyre tread, not only for safety reasons. People often receive reports from their mechanics saying that their tyres desperately need replacing, even when adequate tread remains! This is why you should always ask what the tread depth is, so you can make an informed decision and replace your tyres when needed, and not when they are still viable." ]