Taken from the FAQ, certain questions 'should not be asked here', and the reason given was 'Chatty, open-ended questions diminish the usefulness of our site and push other questions off the front page.'
How, exactly, is the usefulness diminished? Who cares if questions are pushed off the front page? Even if it is a 'dumb', 'subjective', and/or 'chatty' question, the asker is doubtful to be the only person with the question. I would even say a bad question with lots of downvotes or with answers constructively explaining why it's a bad question adds to the usefulness of the site.
As to the 'front page' argument, as long as tags are added and the title is worded even somewhat relevant to the question, the question and the answers will be available though searching google and the site. Is the look of the front page of this site so important that its worth diminishing the information content and number of (perhaps useful) questions?
tl;dr: Why can't we just allow any answerable question about bicycles here, and not police the content?