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Visual tyre inspections - How often do you do yours?

49er

49er

Forum Sage
Past Site Supporter
They should be done before each ride, yeah right!!

I have a front Sport Demon that has outlasted 1 &1/2 rears, but is badly cupping. On this mornings inspection, I discovered a lamination that runs transversely across the tread. I was dismayed to find this, as I have a pretty high regard for these tyres general performance. Is lamination a general regular occurance across brands, or should I be weary of replacing this tyre with a replacement Sport Demon?

http://i155.photobucket.com/albums/s309/49er_photos/P1000370.jpg

http://i155.photobucket.com/albums/s309/49er_photos/P1000369.jpg
 
I don't think that's anything to do with lamination, not sure what it is. Good time to ask some tire experts?
 
This tire looks pretty well used up so no real loss in tossing it.


P1000370.jpg


P1000369.jpg
 
Com on Ed, it's only just scrubbed in. ^o

Alright it's stuffed, but should it have laminated at all? It's definetly lamination and it isn't just situated in that position.
 
Either you ran over a perfectly straight knife or bad molding from the manufacture.
 
chef1366 said:
Either you ran over a perfectly straight knife or bad molding from the manufacture.
Click to expand...

No knives involved here. I could see that glazed look in your eyes Bill. :D

When I peel back the rubber, I can see the shinny surface of rubber at an oblique angle to a depth of around 2-3 mm. IMO, definately a molding flaw.

If it were in a steel section, it would have been caused by the metal cooling too fast during the extrusion process. Possibly the same for rubber.
 
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