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  1. Replies
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    In your steak example, compare the salt content...

    In your steak example, compare the salt content before to the salt content afterwards. You've increased it by a factor of 5. That's a huge change.

    A hundred grams compared to 100 Kg is a factor...
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    You can even slide the line along the curve. ...

    You can even slide the line along the curve. Fdrag = Frolling (with the default settings) at 16 kph which is 10 mph. And, again, this is for well rolling tires. More poor tires and the cross over...
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    Awe. Some.

    Awe. Some.
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    It's a very good question. There's a program...

    It's a very good question. There's a program called cheetah that does this (using a power meter and a closed loop track). If you know the elevation well of a hill, you can get it from many GPS tracks...
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    Yes. This.

    Yes. This.
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    It depends on your inputs. This calculator ...

    It depends on your inputs. This calculator shows a cross over point at 16 mph, which is 10 mph. But that's with good tires. With a lot of tires, rolling resistance is much worse.
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    The switch over point is much closer to twice...

    The switch over point is much closer to twice that value.

    No, rolling resistance isn't underestimated in importance for anybody doing less than 15 mph. Yes at the high end aerodynamic drag becomes...
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    Awesome!

    Awesome!
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    Better rolling tires will make a much bigger...

    Better rolling tires will make a much bigger difference than lighter wheels.

    If you've got crappy hubs, you'll notice replacing those.
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    Your second sentence answers your first question....

    Your second sentence answers your first question. :)
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    For what it's worth, consider folding pedals when...

    For what it's worth, consider folding pedals when teaching bigger kids how to ride. You fold them up when they are just balance biking and can pop them down when they want to try and pedal. If they...
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    Nope. That's pretty much it.

    Nope. That's pretty much it.
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    Clipless or platform?

    Clipless or platform?
  14. Butt... Isn't that exactly what your supposed to...

    Butt... Isn't that exactly what your supposed to do. Get new bike, of on old saddle and pedals?
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    Having either clips or half clips with no straps...

    Having either clips or half clips with no straps helps ensure your for doesn't fly off the pedal.

    If you really want music, a small speaker on your bike that is quiet enough so you can't hear the...
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    Nice. :D

    Nice. :D
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    4 m/s is 9 mph, not the 11 mph of the faster...

    4 m/s is 9 mph, not the 11 mph of the faster bike.

    When climbing hills, your average rider is going to be, in general, less aero than usual.

    But, yes, it all depends.
    And even with the...
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    No, what I wrote was correct. At slow speed,...

    No, what I wrote was correct. At slow speed, aerodynamic drag is not important, but it starts to become important at 10 mph. But nice try.
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    Almost, yes, if he's going slowly enough. But not...

    Almost, yes, if he's going slowly enough. But not at 10 mph is where the difference will become less as the aerodynamic drag becomes important.

    It's not that weight is irrelevant. It's that it is...
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    Neither tread nor tire size have necessarily...

    Neither tread nor tire size have necessarily large effects on rolling resistance. If you can the difference, it was rolling resistance. The weight difference between tires is miniscule compared to...
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    That's rolling resistance, not wheel weight.

    That's rolling resistance, not wheel weight.
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    Your lighter bike probably has faster tires. So...

    Your lighter bike probably has faster tires. So not an apples to apples comparison.

    And you can throw a heavier apple further than a light one (momentum versus air drag).

    Anything else you...
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    Well, admittedly, I started watching Doctor Who...

    Well, admittedly, I started watching Doctor Who almost two decades before getting my PhD in physics, but I rely on the latter more in these cases... :D
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    People often underestimate how dangerous...

    People often underestimate how dangerous lightening is. It's safe inside a fully enclosed car because you're inside a metal Faraday cage. On a bicycle, you've got nothing.
  25. Thread: LOW gearing

    by cplager
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    In this case, get off the bike and shift it into...

    In this case, get off the bike and shift it into a higher gear. Then downshift again.

    (Starting on steep slopes is even more difficult on a FWD recumbent... )

    I routinely ride at under 3 mph....
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