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I'm guessing the point was to illustrate a person who due to injury or back problems is unable to ride with a longer stem?
Everyone is different. It's not a case of 'able' but instead 'most comfortable/natural'.
But talking of the pictures, it the Australian guy meant to an ideal set up?
They are all the ideal setup... for that rider.
It seems to me that he is in violation of the rule (of thumb) that you should not be able to see your hubs over the handlebars?
That's just a reference point. Rules >>>
I'm guessing the point was to illustrate a person who due to injury or back problems is unable to ride with a longer stem?
But talking of the pictures, it the Australian guy meant to be an ideal set up? It seems to me that he is in violation of the rule (of thumb) that you should not be able to see your hubs over the handlebars?