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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > How To Calculate Tire Tread Percentage?



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      11-29-2008, 08:03 PM   #1
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How To Calculate Tire Tread Percentage?

Does anybody know how?

I have the tire tread depth gauge but how can i get the percentage of the tread 6/32?


Thank you in advance
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      11-29-2008, 09:01 PM   #2
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Originally Posted by MTL Bimmer View Post
Does anybody know how?

I have the tire tread depth gauge but how can i get the percentage of the tread 6/32?


Thank you in advance
you need to check what depth the tires came with new. its listed on tire rack under specs. its usually around 10/32nds or 11/32nds
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      11-29-2008, 09:03 PM   #3
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Look up what the tire's tread depth was new and divide. If it was 11/32 and now is 6/32 then 55% of the tread is remaining. Minimum tread wear is 2/32. That would mean 44% of the usable tire is remaining.
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      11-30-2008, 07:23 PM   #4
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Thanks guys

clickclickboom, how did u do the calculation?

Thanks
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      11-30-2008, 08:23 PM   #5
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Originally Posted by MTL Bimmer View Post
Thanks guys

clickclickboom, how did u do the calculation?

Thanks
lets say your tire has an original tread depth of 10/32nds, your tire measures 8/32nds. min tread depth is 2/32nds.


subtract the min tread depth from the current tread depth. 6/32nds

you can ignore the 32nds since they're all the same unit

6/10= 60% useable tread life.

however, if you're expressing it in terms of % tread (not tread life) left, just divide current tread depth by original tread depth 8/10=80% tread left.

most used tire sales i've seen speak of the tread left, not useable tread life.

the new tire tread depth includes the 2/32nd min tread depth. a new 10/32nd tire really only has 8/32nds of useable tread depth.
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      11-30-2008, 08:42 PM   #6
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Quote:
Originally Posted by Orient330iNYC View Post
lets say your tire has an original tread depth of 10/32nds, your tire measures 8/32nds. min tread depth is 2/32nds.


subtract the min tread depth from the current tread depth. 6/32nds

you can ignore the 32nds since they're all the same unit

6/10= 60% useable tread life.

however, if you're expressing it in terms of % tread (not tread life) left, just divide current tread depth by original tread depth 8/10=80% tread left.

most used tire sales i've seen speak of the tread left, not useable tread life.

the new tire tread depth includes the 2/32nd min tread depth. a new 10/32nd tire really only has 8/32nds of useable tread depth.
Thanks man .....i wanna sell my tires and want to know how much % left so i can't tell the guy, i don't want to say there is 60% left and it actually has 50% of usable treads....you know what i mean .

Ok so, the new tire is 10/32nds (checked on tirerack) MINUS 2/32nds = 8/32nds there is 6/32nds left.
10/32nds MINUS 6/32nd = 4/32nds, then 4/32nds DIVIDED BY 8/32nds = 50% left no?
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      11-30-2008, 09:25 PM   #7
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Quote:
Originally Posted by MTL Bimmer View Post
Thanks man .....i wanna sell my tires and want to know how much % left so i can't tell the guy, i don't want to say there is 60% left and it actually has 50% of usable treads....you know what i mean .

Ok so, the new tire is 10/32nds (checked on tirerack) MINUS 2/32nds = 8/32nds there is 6/32nds left.
10/32nds MINUS 6/32nd = 4/32nds, then 4/32nds DIVIDED BY 8/32nds = 50% left no?
make it easy, tell them the new tread depth and the current tread depth.
let them do the math and come to the conclusions
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      12-01-2008, 12:55 PM   #8
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Quote:
Originally Posted by Orient330iNYC View Post
make it easy, tell them the new tread depth and the current tread depth.
let them do the math and come to the conclusions
Excellent idea

but it's also good to know hehe


Thanks guys
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