This is a Continental 4000S racing bike tyre that has now covered over 5000km. The small holes are tread indicators. When the tread is too worn down the holes disappear. This tyre has hardly any indication of wear, has had no punctures and grips really well on the road. The rubber has a very high (7 times greater than normal) carbon content, apparently due to the use of nanotechnology - plus it has had all of its use at a very high pressure of from 110 to 115 psi. Amazing technology altogether. My early days of cycling involved constant puncture repairs and it's still hard to believe how technology has evolved so much.
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