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Old 11-19-2005, 12:40 AM   #1
Justin e36
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Question about Tire Tread Depth..

how exactly is tread depth calculated?

Is 8/32nds tread depth left good for Pirelli Snow tires?

J

edit: mods - please move this to the wheels & tires section.

Last edited by Justin e36; 11-19-2005 at 01:04 AM.
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Old 11-19-2005, 02:01 AM   #2
Mystikal
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Tread depth is calculated as the measurement from the upper edge of tread to the base of the tire.

Winters typically come 11/32 to 13/32 new (higher performance tires come with less tread, for less squirm under load), and you typically don't want to use a winter tire with less than 6/32nds of tread remaining. So while those 8/32nd tires look pretty damn new, especially compared to summer/all-seasons, they don't really offer more than one season of good performance.

Or, to calculate their value, Pirelli snows are typically 11/32nds. Those tires have only 40% of their life left, so they should be worth 40% of the original purchase price. Also keep in mind tires lose their capabilities as they age, so 40% is being generous.
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Old 11-21-2005, 04:26 PM   #3
mirek
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Quote:
Originally Posted by Justin e36
how exactly is tread depth calculated?

Is 8/32nds tread depth left good for Pirelli Snow tires?

J

edit: mods - please move this to the wheels & tires section.

Pirelli says 8/32 is 35% tread used... 65% remain.
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Old 11-21-2005, 06:37 PM   #4
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A winter tire is no longer a winter tire when it is lower than 6/32nds. It becomes useless in snow or slush.
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