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Conti GP4000SII tires have 'holes'?

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Conti GP4000SII tires have 'holes'?

Old 03-10-18, 06:18 PM
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phtomita
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Conti GP4000SII tires have 'holes'?

I've put some 80 miles on these tires and was checking if there is some small rock or anything stuck on the tire.
Nothing found .

But, I see these 2 'holes' on my front and back tires - very close each other.
What are those? Bad tire?
I bought them from Ribble in January when started buying parts for my rebuild.

The zoom is from rear tire.
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Old 03-10-18, 06:24 PM
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I've seen those in all the GP4000 I've bought for the last several years. No problems for me. Something from the molding process most likely.
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Old 03-10-18, 06:24 PM
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They're tire-wear indicators. When you can't see them anymore, you replace the tire.
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Old 03-10-18, 06:28 PM
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Ah! Thank you so much - so it is by design.
But somehow seems a weak spot if you have luck (unluck) to get some rock or glass in it.
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Old 03-10-18, 06:28 PM
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When the hole gone the tire is done
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Old 03-10-18, 10:06 PM
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Originally Posted by phtomita View Post
Ah! Thank you so much - so it is by design.
But somehow seems a weak spot if you have luck (unluck) to get some rock or glass in it.
I've never had a problem with them.

They are wear indicators.
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Old 03-11-18, 01:21 AM
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Notice the tiny arrow with TWI next to it pointing at the hole
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Old 03-11-18, 02:20 AM
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Originally Posted by phtomita View Post
Ah! Thank you so much - so it is by design.
But somehow seems a weak spot if you have luck (unluck) to get some rock or glass in it.
That was my initial concern with the wear indicator holes in Conti Ultra Sport 2 tires. But it hasn't been a problem so far.

One cut in 500 miles, from a bit of embedded broken glass, and that happened Saturday morning. No problems with the wear indicator holes.

The only Continental tires I ride that do pick up pebbles and bits of debris are Speed Rides on my hybrid. Great tires, highly recommended for dry mixed terrain and pavement. But the file tread does pick up small pebbles. So far the pebbles haven't caused flats -- those came from broken glass. The file tread is its own wear indicator, no need for the holes in the slick road tires.
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Old 03-11-18, 07:33 AM
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Tread wear - Continental Bicycle Tyres UK
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Old 03-11-18, 09:14 AM
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Since I have a phobia about using worn out tires I find these tread wear indicators a great confidence builder. Also I can run these longer knowing that they still have safe tread left.
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Old 03-11-18, 10:21 AM
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If you use folding tires, when the wear indicators are worn through there is still some mileage left on those tires. This is a good time to use such tires as emergency spares. At that point, they don't weigh much; mabe 200 grams.
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Old 03-11-18, 10:29 AM
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I use the visible carcass threads as a wear indicator.
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Old 03-11-18, 05:59 PM
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Originally Posted by phtomita View Post
Ah! Thank you so much - so it is by design.
But somehow seems a weak spot if you have luck (unluck) to get some rock or glass in it.
Yes, those spots are going to be slightly weaker than the non-dimpled areas. But consider the odds of a rock or piece of glass hitting the tire at exactly one of those spots. Compare the total contact area of the tire with the total area of those dimples and I'm going to guess it's 99% to 1% (perhaps less!).
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Old 03-11-18, 06:43 PM
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Originally Posted by SquidPuppet View Post
I use the visible carcass threads as a wear indicator.
+1

On a high quality tire with cotton casing one can see small cotton fibers peek through the rubber just prior to seeing the actual threads. It is my experience that flats are soon to follow and the tires are done.


-Tim-
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Old 03-11-18, 06:46 PM
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Originally Posted by SquidPuppet View Post
I use the visible carcass threads as a wear indicator.
Or when I can read the tube manufacturer name through the tire.
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Old 03-11-18, 10:05 PM
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Old 03-13-18, 06:30 PM
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Originally Posted by Camo1976 View Post
When the hole gone the tire is done
I've found that at that point they still have 200-400 miles left before carcass threads start to show.

400 miles later:

Last edited by Drew Eckhardt; 03-13-18 at 06:42 PM.
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Old 03-13-18, 06:55 PM
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Old 03-13-18, 07:58 PM
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Originally Posted by Drew Eckhardt View Post
I've found that at that point they still have 200-400 miles left before carcass threads start to show.

400 miles later:
And 200 to 400 miles more with a couple drops of super glue.
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Old 03-13-18, 08:10 PM
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Old 03-14-18, 06:29 PM
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They are speed holes . make you go fastfast!!!!!
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Old 03-15-18, 03:57 AM
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TBH I've never had those GP4KSII's last long enough to wear through the "wear indicators". Either a sidewall tear or some other failure which is why I don't do conti any more.

scott s.
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