Re: Riding through the years.

On Sun, 5 Jan 2025 21:36:02 -0500, Frank Krygowski
<frkrygow@sbcglobal.net> wrote:

On 1/5/2025 11:01 AM, AMuzi wrote:

On 1/4/2025 6:12 PM, Tom Kunich wrote:

I ride almost 4 times a week and until recently with a fair sized group.
Now there are about 6 of us that ride together on and off. But a lot
of my
riding now is solo. This largely because the group is aging and losing
the
ability to do the rides that I still do. Saturday rides are easy rides
but
on the way out to the coffee stop, they ride harder than I care to, and
then on the return trips they are riding a lot slower having burned
themselve out.
>
Perhaps one of them is capable of doing my North Palomares route but
if he
did he would drop me like a stone since he is 20 years younger than me.
And he would freeze to death at the top waiting for me. So the group id
sging out from under me. Or too young snd too fast to ride at my speed.

 
Four degrees at dawn today. I skipped; too damned cold.

>
Warmer than that today, but still too cold for me. I took a walk in the
forest preserve instead.
>
I saw someone had ridden a bike through there, based on tracks in the
packed-down snow on one gravel roadway. His tires weren't wider than 32mm.
>
It got me thinking about the old puzzle of trying to determine the
direction a bike was going from its tracks. It's not easy! I could tell
the front tire track from the rear because the front track has a sharper
radius of curvature. But which direction? (Arthur Conan Doyle got this
puzzle wrong in one Sherlock story.)
>
I'm pretty sure I was able to work it out eventually, but from extra
information. The tracks were straight on one short steep hill, which
seemed to be a clue that he descended it instead of climbing it. (In
addition to wobbling a bit on a climb, I think his rear tire might have
spun a bit climbing it.) I was also looking for an obstacle that he
would have swerved a bit to clear, which would have given another clue,
but didn't spot one.

For masochists who enjoy such puzzles:

"Sherlock Holmes and the Bicycle Tracks"
<https://mathweb.ucsd.edu/~ebender/87/bicycle.pdf>

"The Adventure of the Priory School".
<https://sherlock-holm.es/stories/pdf/a4/2-sided/prio.pdf>


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Jeff Liebermann                 jeffl@cruzio.com
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