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This is 700x25 continental Ultra Sport II

I noticed there are two holes in both tires, and wonder if this is a manufacturing fault, or simply a wear indicator?

enter image description here

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Yes, those are wear indicators.

The change is noted by retailers:

Note: Continental has added wear indicators to all Continental Gatorskin tires. These small divots in the tread surface are intentional and are not a sign of a factory defect. Once the rubber wears to the point where the divots are no longer discernible, you'll know it's time to replace.

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This is a tread wear indicator, and is present on all modem continental tyres.

When the indicator disappears, it is time to replace your tyre.

see link directly from Continental: http://conti-tyres.co.uk/tread-wear

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Highly likely to be a wear indicator. The Conti Grand Prix 4000s have them as well.

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  • I've had these on my tires Grand Prix 4000 sII (perhaps a bit smaller) from the day I got them. I've ridden them a couple thousand kilometers and haven't experienced any problems.
    – Kibbee
    Commented Jul 24, 2015 at 19:20

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