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  1. I was thinking of centrifugal force when I was...

    I was thinking of centrifugal force when I was writing about Coriolis. I apologize for my error.
  2. It's strongest for the deflection of horizontal...

    It's strongest for the deflection of horizontal motion parallel to a longitude closest to a pole because that depends on the rotational velocity, but it's weakest for vertical motion: drop a lead...
  3. I have to buy the chain first. Why didn't I...

    I have to buy the chain first.


    Why didn't I think of that?

    Walmart sells a 3/32-inch chain for $10, a 5/64-inch chain for $15. If the latter will fit I'll try one; if it lasts longer I'll...
  4. The Coriolis pseudo-force (it's an illusion...

    The Coriolis pseudo-force (it's an illusion caused by the rotation of the Earth - or any rotating frame of reference) is strongest at the Equator and disappears at the Poles.


    They were. The...
  5. 5/64" wide chain with a cassette (8-speed) and chainring 'built' for a 3/32" chain?

    Can I use a 5/64-inch wide chain with a cassette (8-speed) and chainring 'built' for a 3/32-inch chain?

    Do 5/64-inch wide chains have thinner plates or just shorter pins? Are they stronger? If...
  6. No: the bearings wouldn't have stayed in the race...

    No: the bearings wouldn't have stayed in the race without grease. And it worked well for most of the last 2 months.
  7. About. Looks and feels okay. I don't...

    About.


    Looks and feels okay.



    I don't recall a subsequent injury.
  8. Why would 1 side of a hub's bearing be dry but not the other?

    I re-greased the bearings of the hub of the front wheel. 1 side was dry, the other not. I last greased it 1,381 miles ago, 2 months ago.
    I keep it inside; I haven't been out in the rain. I...
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    If there's no friction one cannot accelerate a...

    If there's no friction one cannot accelerate a bicycle - unless one also has a rocket. A rocket has to eject stuff - usually burnt fuel - to accelerate in space: momentum is conserved.
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    Whenever I paint a kitchen appliance (white) or...

    Whenever I paint a kitchen appliance (white) or my pickup (red and black) I clean out the nozzle on my bicycle's frame, so it's all splotched.
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    The 200-pound rider needs 11% more power to...

    The 200-pound rider needs 11% more power to accelerate (which includes gaining altitude, not just increasing speed) but once both have gained a constant speed the losses to drag and in the power...
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    How do you accelerate if there's no friction?

    How do you accelerate if there's no friction?
  13. Have you considered walking backwards? ...

    Have you considered walking backwards? https://www.youtube.com/watch?v=RJOEvt_goIc
  14. Toe clip toenail: is there such a thing?

    About 10 or so years ago I dropped something on my left foot that was so heavy it caused the loss of the big toe's nail. This had happened to me twice before - the nail had grown back in a few...
  15. 'Neck Impalement during Mountain Biking'

    Neck Impalement during Mountain Biking

    N Engl J Med 2015; 373:366 July 23, 2015DOI: 10.1056/NEJMicm1412571
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    Yes. But I've lived many years in wet places. ...

    Yes. But I've lived many years in wet places.

    Mostly my own, occasionally friends'.

    I've had the same bicycle for 20 years - though I did replace the frame once (and the fork once, the...
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    I've been riding bicycles for 50 years, never...

    I've been riding bicycles for 50 years, never lubricated a seatpost or had one stick in the least.

    I have had trouble tightening them enough to prevent slipping. I had a period when it slipped...
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    Grease? I've never used any and never had a...

    Grease? I've never used any and never had a seatpost stick in the least. I'd worry about slipping more.
  19. The cable pulls down. Now you tell me.

    The cable pulls down.



    Now you tell me.
  20. I lowered the front derailleur 4mm and solved...

    I lowered the front derailleur 4mm and solved this problem. I don't remember raising it: could it have worn in such a way to make shifting from the small to the middle difficult?
  21. View Post

    I bought a cheap Al (Alú brand) frame 17 years ago and still have it. I've ridden about 80K miles on it, much of that on unpaved mountain roads. It has a couple of dents that I only noticed when I...
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    There are anti-theft skewers. I think the trick...

    There are anti-theft skewers. I think the trick is that one can't remove them unless one can turn the bicycle upside down. Zefal 'Lock n Roll' is one brand; Delta 'Hublox' another. I don't have...
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    Baby rabbits and bicycle pumps

    http://www.nytimes.com/2015/05/27/world/europe/danish-radio-station-defends-host-who-clubbed-rabbit-to-death-during-animal-welfare-debate.html




    A bicycle pump?
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    What makes a chainring 'compact'?

    Some chainrings are described as 'compact'; what does that mean? thinner?
  25. I've done a lot of shopping but have yet to find...

    I've done a lot of shopping but have yet to find a chainring identified as a middle. Every 36 I have seen has called itself an inner; would that be because everybody else uses a 36 as an inner? ...
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