Legal minimum of tread on a tire? - Chicagoland Sportbikes
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post #1 of 13 (permalink) Old 09-23-2008, 02:31 PM Thread Starter
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Legal minimum of tread on a tire?

So I was reading another forum and someone posted that they went through a safety checkpoint in Wales where the police do an inspection of all motorcycles that pass by. When they checked his rear tire tread it was found to have .82mm of tread at one spot and the legal limit in Wales in 1.0mm at the lowest spot. This cost him 3 points on his driver's license and he is going to give up riding as he is too scared of losing his license!
I was just wondering if there is a legal limit to the depth of tread on bike tires? And, more importantly, is it routinely enforced? (I would imagine this could be one of those laws that is enforced only if the cop is pissed at you for some reason but can't cite you for anything else.)

And before y'all flame, no I don't have bald tires and no I wouldn't ever want to ride on bald tires, I'm just curious about the laws here and how they compare.

Thanks! =)
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post #2 of 13 (permalink) Old 09-23-2008, 02:48 PM
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I believe only a handful of states in the US have mcy inspections.. az and ca come to mind, probably others in that region too.

As for getting tickets for bald tires, I doubt most cops around here would check out the bike closely enough, even in a traffic stop unless it was very obvious.

This site has some useful info: http://www.eastcoastmarc.org/art_laws.htm . Might be a bit out of date too.. from 2001.

Last edited by GPz1100; 09-23-2008 at 02:54 PM.
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post #3 of 13 (permalink) Old 09-23-2008, 02:51 PM Thread Starter
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Yeah this was an inspection and from the guy's post it sounded like they were trying to find something on every bike to write a citation for, they had the micrometer for measuring tread and all..
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post #4 of 13 (permalink) Old 09-23-2008, 03:09 PM
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lincolns head on a penny is a good rule for car tires, ill probably follow a little past that with the bike as i dont ride in snow and attpempt to avoid rain unless im already out

-Jason
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post #5 of 13 (permalink) Old 09-23-2008, 04:52 PM
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2/32's of an inch is the legal minimum tread depth for a street tire.




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post #6 of 13 (permalink) Old 09-23-2008, 05:01 PM
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Originally Posted by HDTony View Post
2/32's of an inch is the legal minimum tread depth for a street tire.
or 1/16.

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post #7 of 13 (permalink) Old 09-23-2008, 05:16 PM Thread Starter
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or 1/16.

yay fractions! +rep!
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post #8 of 13 (permalink) Old 09-23-2008, 05:20 PM
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yay fractions! +rep!
Don't laugh. Fractions is kicking my ass right now in my math class.
Ofcourse I'm doing a little more than just reducing, but it's still a fraction.

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post #9 of 13 (permalink) Old 09-23-2008, 05:29 PM
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Quote:
Originally Posted by scout67 View Post
or 1/16.
Quote:
Originally Posted by merlin72875 View Post

yay fractions! +rep!
Math geeks!

Dont ask me why they wrote the law that way.




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post #10 of 13 (permalink) Old 09-23-2008, 05:48 PM
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Here is a neat little tread depth guage. I still have this one from my car racing days.

http://www.sweetmfg.biz/products3.asp?edit_id=54

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post #11 of 13 (permalink) Old 09-23-2008, 05:51 PM
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Originally Posted by HDTony View Post
Math geeks!

Dont ask me why they wrote the law that way.
I got a feeling the measure stick was graduated in 1/32's when they wrote the law. So the officers only need to remember 2 lines is legal.


BTW, when you changing your screen name to make an honest women out of "your babies momma"?

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Last edited by scout67; 09-23-2008 at 05:59 PM.
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post #12 of 13 (permalink) Old 09-25-2008, 11:45 AM
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Dont sweat it- I have been followed by, and had cops stop behind me at stop lights with all kinds of cords showing and never been stopped or questioned. It probably looks like a strobe light when Im riding

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post #13 of 13 (permalink) Old 09-25-2008, 08:12 PM
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Quote:
Originally Posted by spoil9 View Post
Don't laugh. Fractions is kicking my ass right now in my math class.
Ofcourse I'm doing a little more than just reducing, but it's still a fraction.
Partial fraction decomposition FTL

Quote:
Originally Posted by Arch View Post
In motorcycle terms, that's like taking your Ducati to a dealer for service, and they hand you back a 1979 backfiring Honda 400 Hawk.. because after all, a bike is a bike.
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