When to change a tire?

**jonmike** · July 15th, 2007 09:01 AM

Hey guys,

I need some help. I'm not sure when to change my tire? It's a Michelin so the thread indicators are Michelin himself. I'm not sure whether Michelin should be worn out completely before I change them or a part of him?

KM travelled by other tires: 27+++kms.

Thanks in advance!

Note: Btw, this is a pic of the spare tire (changed about a month ago) so medyo ok pa siya.

**torque2006** · July 15th, 2007 10:01 AM

eyng? thread indicators come out in the middle of the tire. pag lumabas na yung mga "S" grooves sa gitna ng thread. ayun ang turo saken.

baket sa sidewall? ganyan ba talaga ang michelin?

**B2Bomber** · July 15th, 2007 10:02 AM

shouldn't there be a bar across tread that indicates whether you need to replace your tires already?

coz' IMHO and CMIIW, if the michellin man IS the indicator, then if the tires get scrubbed badly on curbs and the michellin man gets "erased" then that'd mean you'd have to change tires already?

additional info from the Michellin Man himself...

**jonmike** · July 15th, 2007 10:54 AM

Kasi I noticed sa Bridgestone and sa Goodyear para triangle yung thread indicator niya e. Don't know whether the triangle part should be worn out though or should only touch the top part of the triangle.

**sirmykel** · July 15th, 2007 11:45 AM

goodyear at bridgestone meron small bars in between the threads. kapag umabot na un, yun ata yung pinaka accurate sign na magpalit na ng gulong

**restituto** · July 15th, 2007 12:55 PM

What is shown in the picture is not the tread wear indicator but rather its the guide where to find the tread wear indicator (small bars in between the tread). If the small bars across the tread is already exposed or in level with the worn-out treads, then its the time to change your tire.

**restituto** · July 15th, 2007 01:12 PM

Tread depth and tread wear indicators

For the most part, motoring law in most countries determines that your tyres need a minimum tread depth to be legal. This varies from country to country but is normally around 1.6mm. To assist you in figuring out when you're getting close to that value, most tyres have tread wear indicators built into them. If you look around the tread carefully, at some point you'll see a bar of rubber which goes across the tread and isn't part of the regular pattern (see the picture here for an example). This is the wear indicator. It's really basic, but it's also pretty foolproof. The tread wear indicator is moulded into the rubber at a depth of about 2mm normally. As the rubber in your tyres wears away due to everyday use, the tread wears down. At some point, the tyre tread will become flush with the wear indicator (which is normally recessed into the tread). At this point you have about 2mm of tread left - in other words it is time to change tyres.

Hope this helps....drive safely...

**B2Bomber** · July 15th, 2007 01:16 PM

checking tread wear according to :

GoodYear

and

Bridgestone

both of which refer to a bar across the thread just like Michellin's... and I suppose as well as other brands.

hth

**pathfinder8604** · July 15th, 2007 02:26 PM

Tread depth
Tires must be replaced when the treadwear indicators (they look like narrow bars of rubber) become visible. These narrow bars of rubber indicate that the tread is depth is down to 1/16"*
When wear bars are visible, the tire is worn out and must be replaced.
*This might be expressed as 2/32´´. 32nds of an inch are the industry standard for tread depth measurement)

*This might be expressed as 2/32´´. 32nds of an inch are the industry standard for tread depth measurement)
UTQGS
Uniform Tire Quality Grade System: This is a coding that is required by the US government. Tire manufacturers assign values for Treadwear, Traction and Temperature performance. The standards were originally devised and supervised by the US government and intended to help customers make choices between various types of tire. In recent years, however, government involvement has declined and manufacturers have each been conducting their own tests independently. This clearly makes comparisons between brands unreliable. Values are still useful for relative comparisons within a given manufacturer's tire line, though.
The Uniform Tire Quality Grading Ratings (UTQG) is a tire information system designed to help you make the relative comparisons among all passenger car tires. The UTQG rating tells you about the tire's treadwear, traction, and temperature grades.
Size Treadwear Traction Temperature
P155/80R13 600 A B
P175/70R13 560 A B
P175/65R14 600 A B
P175/70R14 600 A B
P185/65R14 600 A B
P185/70R14 600 A B
P185/70R14 600 A B
P185/75R14 600 A B
P195/65R14 600 A B
P195/70R14 600 A B
P195/75R14 600 A B
P205/70R14 600 A B
P205/75R14 600 A B
P215/70R14 600 A B
P185/65R15 600 A B
P195/65R15 600 A B
P205/65R15 600 A B
P205/70R15 600 A B
P205/70R15 600 A B
P205/75R15 600 A B
P215/60R15 600 A B
P215/65R15 600 A B
P215/70R15 600 A B
P215/75R15 600 A B
P225/70R15 600 A B
P225/75R15 600 A B
P235/75R15 600 A B
P215/60R16 600 A B
215/65R16 600 A B
P225/60R16 600 A B

The Treadwear Rating: The standard rating selected by the government was set at 100 but today all passenger tires easily exceed this. A tire rated at 200 would be expected to last twice as long on the set course as one rated at 100. Treadwear ratings do not apply to Winter, Light Truck or 12" tires.

**pathfinder8604** · July 15th, 2007 02:41 PM

vehicle tires have a 4 year validity period from their DATE OF MANUFACTURE (DOM). Thereafter, the tire expires and may burst while in use. how to find if the tire is expired? check for a stamp like this: (*2603*) there is an asterisk at the beginning and at the end of this serial number. The first two numbers 26 will tell which week of the year has it been manufactured. it shows that 26 weeks of 2003 the tire is manufactured.