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Will e-bikes expand cycling?



 
 
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  #191  
Old November 10th 19, 06:55 AM posted to rec.bicycles.tech
John B. Slocomb
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Posts: 533
Default Will e-bikes expand cycling?

On Sat, 9 Nov 2019 20:15:13 -0500, Frank Krygowski
wrote:

On 11/9/2019 7:28 PM, John B. wrote:
On Sat, 9 Nov 2019 18:52:04 -0500, Frank Krygowski
wrote:

On 11/9/2019 6:20 PM, John B. wrote:

I suppose that I am a cynic but I can see no use at all for tire
pressure monitors, or for back up radar for that matter. Oh well, I
suppose it eliminates the need to turn one's head when walking by the
car, or backing up. Or maybe one might say, "to pay attention to what
one is going" :-)

My experience with the TPM system:

Again, mine monitors wheel rotation speed, which makes more sense to me.
The system is there for anti-lock brakes anyway, so why not use it?

Anyway, the Mazda 3 seems to have a problem with rear disc brakes. Front
were fine but rear were worn at maybe 40,000 miles. I replaced them,
after a little trouble getting pads. (Two brake sources, different pads,
mine the less common by far.)

The replacement pads seemed slightly tight going in. After some short
time, I got a "Tire Pressure" alert while driving, but pressures looked
fine. However, right rear disc was HOT. The pads were dragging enough to
slow that wheel and trigger a warning. I pulled the pads, ground the
edges that contacted the caliper, lubricated with anti-seize and all was
good. I later repeated for the other rear wheel.

Something seems funny here. The brake dragged so the wheel slowed
down? Was the tire skidding along the ground?


Not skidding in a noticeable way, certainly. The event happened at night
on dark country roads, so when I got the alert, I didn't stop. Instead I
felt for odd behavior when turning or when I swerved a bit as a test.
(In the past, I've been able to detect a low tire that way on other cars.)

I felt no difference, which I took to mean the low pressure was minor.
(I don't know the threshold for the warning light.) But when I came to a
business with a yard light I stopped to check it out. The problem was
intermittent, because the rotor was cool 15 miles later at home.

Tires actually "creep" a bit against a road surface, from the deflection
of the rubber as it applies force to the road. I think the braking
torque from the stuck pad generated enough creep to show up as a slower
rotation.


After doing a little reading I believe that the tire rotation speed is
the controlling factor. I read that the tire pressure system warns
when the tire pressure drops in pressure 25%, although this might well
vary from make to make or model to model and 25% of a tire's pressure
is a relatively significant value.From 30 psi to 22 psi.

Firstly a fully inflated has a larger diameter than a partially
inflated dire due to stretching or distorting of the tire, and
secondly a partially inflated tire will have a smaller effective
diameter as the tire will flatten more as it meets the ground, and
differences in diameter will, of course, effect the rpm of the tire.


The details of the system might interest Jeff and others. If you think
about it, differences in rotational speed must be ignored when driving
long sweeping curves. Maybe it looks for one out of three differences,
or maybe it looks at differences that remain over a certain window of time.

BTW, the system must be reset when tires are rotated, as I did two weeks
ago. To me, that says it's pretty sensitive to the differences in
rotational speed. Tire diameters aren't widely different when moderately
worn.

--

Cheers,

John B.
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  #192  
Old November 14th 19, 01:38 AM posted to rec.bicycles.tech
pH
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Posts: 77
Default Will e-bikes expand cycling?

On Saturday, November 2, 2019 at 4:37:44 PM UTC-7, pH wrote:
snip


When I rode to Trader Joes today I saw only 1 assist bike, a mid drive. Lots of "normal" bikes today. I'll try to keep a count of what I see over a week and report later.

pH


Okay, I've been looking since this post. I've only seen 17 motor assists since I said I would keep track and it was 50:50 hub drives vs. mid drives....the *last* one, number 17 was a mid-drive (bosch-pod type thing).

So, I'm wrong (I had previously asserted that the ratio was 10:1 mid drive to hubs here in the Santa Cruz area). Oh well.

I actually saw two of the ba-fang mid drives "in the wild". Was not able to talk to the riders to get wattage and ride impressions in either case.

So that's the scoop around Santa Cruz.

pH

  #193  
Old November 14th 19, 02:05 AM posted to rec.bicycles.tech
Andre Jute[_2_]
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Posts: 9,969
Default Will e-bikes expand cycling?

On Thursday, November 14, 2019 at 1:38:13 AM UTC, pH wrote:
On Saturday, November 2, 2019 at 4:37:44 PM UTC-7, pH wrote:
snip


When I rode to Trader Joes today I saw only 1 assist bike, a mid drive. Lots of "normal" bikes today. I'll try to keep a count of what I see over a week and report later.

pH


Okay, I've been looking since this post. I've only seen 17 motor assists since I said I would keep track and it was 50:50 hub drives vs. mid drives.....the *last* one, number 17 was a mid-drive (bosch-pod type thing).

So, I'm wrong (I had previously asserted that the ratio was 10:1 mid drive to hubs here in the Santa Cruz area). Oh well.

I actually saw two of the ba-fang mid drives "in the wild". Was not able to talk to the riders to get wattage and ride impressions in either case.

So that's the scoop around Santa Cruz.

pH


When you're thinking of something, you see more of them. I was thinking of ordering a Giant semi-recliner that I'd actually never seen in the flesh, and then I saw two passing through my country town... I kept the thing less than a month; those small wheels were useless on potholed roads.

Andre Jute
Try anything once
  #194  
Old August 1st 20, 08:52 AM posted to rec.bicycles.tech
[email protected]
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Posts: 1
Default Will e-bikes expand cycling?

Ase thori
 




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