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#191
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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
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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
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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
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Will e-bikes expand cycling?
Ase thori
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