What is TWI marking on tyre?
Tread wear indicators show the status of the tyre’s tread depth. A tread wear indicator is a narrow elevation across the longitudinal grooves of the tyre’s tread pattern. On the side of the tyre are the letters TWI (Tread Wear Indicator).
How do you read a tire wear indicator?
The penny test is pretty simple. Take a penny and hold it with Lincoln’s head upside down. Place it inside one of the grooves between the tread. If Lincoln’s entire head is visible, your tread has worn down at or below 1/16 of an inch and should be replaced.
What do tyre wear indicators look like?
Tread wear indicator bars are moulded into the tread grooves at regular intervals around the tyre to indicate when a tyre is worn to its limit of safety. The minimum legal tread depth is 1.5 mm across the width of the tread. When the tyre is worn to the legal limit the bars will be flush with the surface of the tread.
What is TWI on a tyre sidewall?
Tread-wear indicators (TWI) means the projections. within the tread grooves designed to give a visual indication of the degree of wear of the tread. Tyres With Non Skid Depth (N.S.D.) less than 0.8mm for two and three wheeler tyres and 1.6 mm for other motor vehicles tyres are unsafe to drive.
What are wear indicators?
Wear indicator bars are placed around the tire at different parts of the tread. Their main function is to show how much tread is left on the tires and to indicate when the tires need to be replaced. During the tire’s lifetime, the entire tire footprint is wearing out.
What does treadwear mean on tires?
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 would wear one and one half times as well on the government course as a tire graded 100.
Do tires have wear indicators?
Tread wear indicators, or wear bars, are spaced evenly through the main grooves in the tire tread. If they are flush with the level of the tread, then the tire should be replaced.
How long do 3mm Tyres last?
With all the possible variables taken into account, the minimum average period 3mm of tyre tread depth will last before it reaches the legal limit of 1.6mm is between would be 10,000-20,000 miles but it could be considerably more than that.
What depth are wear bars on tires?
2/32″
Tire wear bars sit at 2/32″ of tread depth, which is the lowest tread depth allowed by the law – this depends on state to state, but most in most states you can drive your vehicle with that much tread left. Tread wear indicator bars help you visually measure the tread depth left on your tires.
What is a good treadwear rating?
In basic terms, and in the spirit of the concept, the higher the UTQG treadwear rating, the greater the tire life. A tire with a “600” treadwear rating is forecasted to last twice as long as a tire with a “300” rating, and should accumulate three times the mileage of a “200” rated tire.
Is a higher treadwear rating better?
Tread wear (the durability rating) This number designation is designed to give you a picture of the durability or life you can expect from your tire. The higher the tread wear number, the longer the tread wear will last. In this case, a higher number is better than a lower number.
