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How to measure tread on used tires


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7 replies to this topic

#1 rweddy

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Posted 20 December 2004 - 10:27 AM

I am looking at a set of used tires and rims for my OBW.
The seller says they hae 55% of the thread left, how can I measure this to be true?
Also how to make sure they are all the same wear and size?
These were off a forester.

Thanks

#2 Chip

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Posted 20 December 2004 - 12:39 PM

You can usually find out what the original tire depth was by going on a site such as http://www.tirerack.com/ and looking at the specs for your particular tire.

The tread depth is usually measured from the bottom of the deepest groove to the top of the same groove. A typical tread depth is 10/32. A tire is considered finished when the depth gets down to 2/32 so if the tire when new was 10/32 and the actual depth is 4/32 then you're at 50%.....(don't count the last 2/32.
You could also measure from the "wear indicator" which is found at regular intervals around the tire. These bands run from side to side across the tire at the bottom of the grooves and are usually 2/32 high so when the tread indicators are at the same height as the rest of the tread then your tire is 100% worn.

#3 bjwirth

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Posted 20 December 2004 - 12:59 PM

A tire is considered finished when the depth gets down to 2/32 so if the tire when new was 10/32 and the actual depth is >>>4/32<<< then you're at 50%.


6/32 would be 50% right?

#4 rweddy

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Posted 20 December 2004 - 01:44 PM

You can usually find out what the original tire depth was by going on a site such as http://www.tirerack.com/ and looking at the specs for your particular tire.

The tread depth is usually measured from the bottom of the deepest groove to the top of the same groove. A typical tread depth is 10/32. A tire is considered finished when the depth gets down to 2/32 so if the tire when new was 10/32 and the actual depth is 4/32 then you're at 50%.....(don't count the last 2/32.
You could also measure from the "wear indicator" which is found at regular intervals around the tire. These bands run from side to side across the tire at the bottom of the grooves and are usually 2/32 high so when the tread indicators are at the same height as the rest of the tread then your tire is 100% worn.


Thanks!
Is there a tool to measure or can I just use a ruler?

#5 86subaru

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Posted 20 December 2004 - 02:39 PM

i have seen guys use a penny or a gauge ,

#6 Gnuman

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Posted 20 December 2004 - 03:13 PM

i have seen guys use a penny or a gauge ,

If you use a penny, stick it in so Lincoln is facing you and going into the tread head first. If you can see all of Lincolns head the tire is done for. . .

#7 outback_97

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Posted 20 December 2004 - 03:31 PM

FWIW, some snow tires have different compounds at different levels of the tire, so keep that in mind.

Example: Blizzaks (IIRC) have snow and ice compound for the first 50% of the tread depth, then after that they're just plain all seasons with no advantage over normal tires. So, in your case, @ 55% they're pretty much done if they were that type of tire.

Oh, one more thing, do you know how to read the DOT date code?
http://www.tirerack....termtireage.jsp
I learned (after purchasing my tires used) that although the tread was around 90% and the PO told me they were "a couple years old", the tires were several years old. If I'd known that before purchase, I may have kept shopping. But since they seem to be in decent shape I'm giving them a go but keeping a very close eye on them w/r/t pressure and condition.

Steve

#8 Chip

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Posted 22 December 2004 - 07:54 AM

6/32 would be 50% right?


Right...(so much for my math skills...)




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