Circumferential tire wear - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 17 (permalink) Old 08-19-2005, 07:24 AM Thread Starter
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Question Circumferential tire wear

Just pulled the rear off because I noted it needed new rubber about a week ago. No tread left when I first inspected it in the center.

Well, after pulling it off, I see tread in some spots in the middle but not in others.

The wear is even radially (i.e. as you go from the center down to the edges) but not as you look at the center circumferentially (i.e. from one side of the wheel to the other).

What is up with that? Any thoughts on a cause? I have had no skids, stunting, or burnouts. I'd like to avoid having an unevenly worn rear with the new one (to be returned on Sunday) so insights are appreciated.

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post #2 of 17 (permalink) Old 08-19-2005, 08:04 AM
 
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My first guess was hooliganism. Locking the rear wheel and sliding into a parking space, sudden surges of acceleration (not necessarily wheelies, but of the same type) and things along those line. But you strike me as someone who doesnt engage in that sort of activity.
Could you quantify the difference in wear? Some Uneven wear is expected, from uneven rubber compound, to running over small patches of gravel, to whatever else. I'd say if you are within 10% you got nothing to worry about.

Here is a test. See how far the old tire is out of balance, if you have a balancing machine... Of course you would have to do it before you take the tire off, and it would be nice to know how well balanced it was when you put it on... (Assuming you mount your own tires.)



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post #3 of 17 (permalink) Old 08-19-2005, 08:29 AM
 
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wonder what tire manuf. use for acceptable tolerances?

could it be possible that some areas of the tire have slightly more rubber than others?

my wild guess.....
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post #4 of 17 (permalink) Old 08-19-2005, 09:23 AM Thread Starter
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The difference was that on one side there was absolutely no sign of tread versus a tread depth of about 1/16" on another side. Material differences are the only reason I could think of to reasonably explain it but was wondering if I had a possible mechanical situation.

Not doing the install myself and don't have a balancing tool. I might hear back if its out of balance, but I doubt it. But I found a great article on creating a tire change setup and am still mulling that.

The Bridgestones have a depth of 4.3 new and are recommended for removal at 1/32 of an inch of tread depth.

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post #5 of 17 (permalink) Old 08-19-2005, 09:28 AM
 
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I think all tires are recommended for removal at 1/32. I know the state law for inspection in maine require 1/32
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post #6 of 17 (permalink) Old 08-19-2005, 09:56 AM
 
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Being out of balance could be another reason for the wear...


Did they go thru alott of high speed? (150mph..)



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post #7 of 17 (permalink) Old 08-19-2005, 09:59 AM Thread Starter
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Quote:
Originally posted by Vash
Did they go thru alott of high speed? (150mph..)
You must have a pretty short memory. No, high speeds like that aren't my game and no track time either.

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post #8 of 17 (permalink) Old 08-19-2005, 10:31 AM
 
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Didnt think so, just making sure. I was thinking about tire deformation under speed, but thats not it either.



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post #9 of 17 (permalink) Old 08-19-2005, 12:22 PM
 
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Hi All-

If the new tire is mounted and balanced on the existing rim by a professional...the unexpectedly short service life and peculiar wear patterns on the old tire shouldn't really matter, should they?

As long as everything checks-out on the new tire mounted on the old rim you should have successfully eliminated all of the potential variables from the previous installation, short of purchasing a set of aftermarket rims.



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post #10 of 17 (permalink) Old 08-19-2005, 01:12 PM
 
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That's normal, K. My rear tires wear the same way...I think it has to do wth the tire going out of balance as it wears....
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