One of a pair of Continental Grand Prix 4000 S tyres I bought November 2011
had misprinted logos. The two logos on the sidewall are not printed point-symmetrically.
wrong one
correct one
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related article
Golden ratios hidden in a road bike.
What makes a bike beautiful?
I measured various segments found in a road bike
and calculated the ratios of them
supposing them to be one of most important factors.