Quote:
Originally Posted by Bicycle Bob
...… Once they lay the rubber on the road, narrow tires leave it there for support for longer than a wide tire at the same pressure. ...…
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My emphasis!
Part of the problem with testing bicycle tires is that narrow tires require MORE pressure to carry the same load than wide tires. The testing needs to be done at the same load carrying capacity - ergo, different pressures.
This problem is also present in passenger car tires, but to a much lesser extent because a difference of 10 mm width is almost nothing for a passenger car tire.