Please know that some problems have too much information. If you use the information that is unnecessary for solving the problem, you may find that you are required to know strange things... Typically, if there is something that we really did not discuss in class, then it is likely to be a red herring.
In homework #4, the "rolling friction and bicycle tires" problem, is the pressure information a red-herring? Why don't you try solving the problem without using the pressure information first?
An example of a red herring in the past was the terminal velocity of a sky jumper. That terminal velocity was not essential for figuring out the answer.
A red herring does not necessarily mean a bad taste, in my opinion.
One more note: The rolling friction is similar to the static friction in its origin, but is much weaker. For the purpose of the above problem, just treat it as "another friction," like we did in class for static or skidding (thus kinetic) friction of automobile tires.
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