Thread: Better Braking?
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Old February 17th 20, 12:20 AM posted to rec.bicycles.tech
JBeattie
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Default Better Braking?

On Sunday, February 16, 2020 at 11:44:29 AM UTC-8, Frank Krygowski wrote:
On 2/16/2020 10:11 AM, Bertrand wrote:
I was replying to your pedantic remark 'As always: Sorry for
introducing real numbers into a discussion. '. Those are not real
numbers and certainly can not be checked. We have to believe you. In
that case we can also believe Tom saying that thy dyno slowed him down
considerably. BTW I think going from 20 to 19 mph is quite a bit for
some. Bottom line is a dyno(hub) cost you 5-10 W, a battery powered
light not.


Putting some numbers into bikecalculator.com suggests that the
difference between 20 and 19 mph is about 26 watts (207 vs. 181), which
is a lot.


Assuming those calculations are correct: Is that "a lot"? How do we judge?

If told "It's enough to slow you down from 20 mph to 19 mph," I think
most people who were not riding to race would say "Oh, that's not so bad."


It's bad if your killing yourself to hold 20mph to stay on a wheel, which I was actually doing the other night on my way home. Next time I'll shut off my light to see if it gives me any extra speed. I have my battery light that I use as a pulsing light and can use that. More dyno science experiments.. Next I'm going to get a Van de graaff generator for my bike or maybe a flux capacitor.

-- Jay Beattie.




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