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#111
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Voiding the warranty -- Dyno Redux
On Saturday, January 11, 2020 at 3:00:50 AM UTC-6, Sepp Ruf wrote:
wrote: Above is a Shimano dynohub and Mavic rim for $115. This company also sells a Busch Mueller IQ light with 100 lux for $72. So for $200 delivered probably, you would have a better dynamo light than I used on Paris Brest Paris 2007 during the pouring rain. But but but yours was just French Atlantic rain, not the much tougher American Pacific one! Well, it was 50, or 51, or maybe 52 degrees during the very cold and rainy PBP 2007. I suspect it has never gotten that cold along the Pacific coast in the entire history we have been keeping temperature records. Now I realize temperatures do not affect the amount of light generated by the dynohub.. But when your teeth are chattering and hands and body are shivering due to the cold, it might affect things. |
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#112
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Voiding the warranty -- Dyno Redux
On Sunday, 12 January 2020 00:36:17 UTC-5, wrote:
On Saturday, January 11, 2020 at 3:00:50 AM UTC-6, Sepp Ruf wrote: wrote: Above is a Shimano dynohub and Mavic rim for $115. This company also sells a Busch Mueller IQ light with 100 lux for $72. So for $200 delivered probably, you would have a better dynamo light than I used on Paris Brest Paris 2007 during the pouring rain. But but but yours was just French Atlantic rain, not the much tougher American Pacific one! Well, it was 50, or 51, or maybe 52 degrees during the very cold and rainy PBP 2007. I suspect it has never gotten that cold along the Pacific coast in the entire history we have been keeping temperature records. Now I realize temperatures do not affect the amount of light generated by the dynohub. But when your teeth are chattering and hands and body are shivering due to the cold, it might affect things. I wonder if really cold temperatures of 0F affects a dynamo-hub output. I do know that it can affect the run time of a battery powered light and do so drastically which is why I only buy lights with an external battery pack that i can keep warm under my jacket whilst riding in winter when it gets quite cold. Cheers |
#113
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Voiding the warranty -- Dyno Redux
On Sunday, 12 January 2020 00:36:17 UTC-5, wrote:
On Saturday, January 11, 2020 at 3:00:50 AM UTC-6, Sepp Ruf wrote: wrote: Above is a Shimano dynohub and Mavic rim for $115. This company also sells a Busch Mueller IQ light with 100 lux for $72. So for $200 delivered probably, you would have a better dynamo light than I used on Paris Brest Paris 2007 during the pouring rain. But but but yours was just French Atlantic rain, not the much tougher American Pacific one! Well, it was 50, or 51, or maybe 52 degrees during the very cold and rainy PBP 2007. I suspect it has never gotten that cold along the Pacific coast in the entire history we have been keeping temperature records. Now I realize temperatures do not affect the amount of light generated by the dynohub. But when your teeth are chattering and hands and body are shivering due to the cold, it might affect things. It's currently (a:30AM - 0130 hrs)32F here now with light rain. My Magic-Shine knockoff light shows the road and I could see where the light was shining on the road. Now if that light had a cut-off beam and/or a wider angle beam but with the same range, it'd be perfect for me. Cheers |
#114
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Voiding the warranty -- Dyno Redux
On 1/12/2020 1:26 AM, Sir Ridesalot wrote:
I wonder if really cold temperatures of 0F affects a dynamo-hub output. It doesn't. Or more precisely, it makes only negligible difference, very close to zero difference. I've certainly seen no change. If it did cause any change at all, I suspect it would be to slightly raise the output. Resistance of wiring tends to increase with temperature, so it should decrease in colder weather. Less resistance, more power. -- - Frank Krygowski |
#116
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Voiding the warranty -- Dyno Redux
On Saturday, January 11, 2020 at 9:36:17 PM UTC-8, wrote:
On Saturday, January 11, 2020 at 3:00:50 AM UTC-6, Sepp Ruf wrote: wrote: Above is a Shimano dynohub and Mavic rim for $115. This company also sells a Busch Mueller IQ light with 100 lux for $72. So for $200 delivered probably, you would have a better dynamo light than I used on Paris Brest Paris 2007 during the pouring rain. But but but yours was just French Atlantic rain, not the much tougher American Pacific one! Well, it was 50, or 51, or maybe 52 degrees during the very cold and rainy PBP 2007. I suspect it has never gotten that cold along the Pacific coast in the entire history we have been keeping temperature records. Now I realize temperatures do not affect the amount of light generated by the dynohub. But when your teeth are chattering and hands and body are shivering due to the cold, it might affect things. Quoi? Snow is forecast for Portland this week, although Portland is not officially on the coast. I did a 100 mile ride from my house to the top of Larch Mountain six or seven years ago in early spring, all of it was in heavy rain with snow at the top. The descent was the worst day of my life. I was soaked to the bone, and was shivering so hard on the descent I could barely hold the bars. I was doing that squinty-eyed, losing consciousness thing. It's a 15 mile moderate descent with just a few rollers at the bottom, and I had to stop periodically to shake out cramps and try to warm up a little. Some guy did a tedious video of the whole descent. https://www.youtube.com/watch?v=yotPXCgnltE It's a pretty road -- a nice low angle climb and descent. The snow sticks around for a long time, though, and dressing right is practically impossible in spring time. I was with some friends on that ride, and half of them bailed out and called their wives while warming over a floor vent at the Corbett Store. https://media-cdn.tripadvisor.com/me...2-largejpg.jpg I had a life-affirming corn dog and some coffee and rode back to Portland with my neighbor and best biking buddy (and the guy who crashed me two weeks ago). We're going out for a rain ride later today. -- Jay Beattie. |
#117
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Voiding the warranty -- Dyno Redux
On 1/11/2020 1:00 AM, Sepp Ruf wrote:
snip ..[deleted for consumer protection]/en/buy/shimano-custom-made-28-shimano-dh-3n72-hub-dynamo-mavic-a-319-front-wheel-893080 There are many places in Europe selling dynamo wheels for fairly cheap. Absolutely, one just needs to check their overall reputation (bike-component's and bike24's being better than the place you linked), their build quality and for shipping costs stepping up due to wheel size. Yes, for a utility bicycle, a low-end wheel with a low-end Shimano Nexus dynamo hub can be found for around $100 including shipping. https://www.ebay.com/dsc/i.html?x=0&y=0&_sasl=wheelson_shop&_saslop=1&_fss= 1&_pgn=1&LH_SpecificSeller=1&_adv=0&LH_TitleDesc=1 &_nkw=dymano For a mid-range wheel, with an SP dynamo, it's a lot more. In the U.S. these would be custom made wheels and you'd expect to pay retail prices for the hub, spokes, and rim, plus labor, and you'd be at least at $400. An SP-8 dynamo is $135 alone. To convince the average commuter to spend that much on a wheel, then another $130-175 or on a Supernova E3 Pro 2 or Son Edelux II or - Herrmans H-Black PRO, is unlikely──which is why dynamo lights are not popular in the U.S.. Personally, we have four bicycles in our fleet with dynamo lights, and three are mine. Trying to convince others to spend that much money is unlikely. Not many people are going to go buy a dynamo hub fro $125, spokes for about 50¢ each, 28-46 spokes, and lace-up their existing rim to a dynamo hub. |
#118
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Voiding the warranty -- Dyno Redux
On 11/1/20 10:20 am, Frank Krygowski wrote:
On 1/10/2020 9:11 AM, AMuzi wrote: The tight points are more commonly under the caliper(s) and between the chainstays rather than the inside of the fork. I agree, but the bike that triggered this concern (when we were helping our friend shop) was limited at the front fork. It may have had the same limitation at the chainstays, but I don't think I bothered checking, since the fork disqualified the bike. The forks I have on my road bike are very tight at the crown. Not in height but width. I can easily fit 23mm tyres, but 25mm would risk wearing away at the fork crown if it was not very true. Disclaimer: I bought the forks online and didn't realise how tight they would be. However, I've managed pretty well. I don't get pinch flats, and even on the relatively rough roads here I run 90 PSI for a little more comfort. Most of the bitumen roads are ok, but there are short sections here and there where there is a mine field of potholes and patches. So long as I don't hit a pothole, I'm fine. -- JS |
#119
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Voiding the warranty -- Dyno Redux
On 11/1/20 10:15 am, John B. wrote:
On Fri, 10 Jan 2020 09:45:00 -0500, Frank Krygowski wrote: On 1/10/2020 8:25 AM, sms wrote: On 1/9/2020 3:22 PM, AMuzi wrote: snip There's probably a dynohub system coming for my daughter's birthday. Her 800-lumen LiIon light, like her telephone, is usually discharged when most needed. Then you'll want to include a dyno-powered phone charger. She won't be able to run the light and the phone charger at the same time, but at least she can charge her phone in the daytime. https://www.cycle2charge.de/index.php/en/component/jshopping/product/view/1/3.html?Itemid=0. About US$2 worth of components inside, but a bargain compared to some other similar products at 3x the cost. I don't have need for a phone charger as I ride, but I've seen plans for simple homebuilt ones. If that's really a concern for people, perhaps someone could post a link to a suitable circuit. If the phone running out of juice during a ride the cheapest and easiest solution would be to simply carry a battery. the shops here are full of "power packs" that you can plug into your phone to prolong life :-) On the other hand, based on the number of disparaging posts I've read here about people using their phone while driving perhaps the best solution would be simply to discourage the use of phones while riding. If I was to go on a bicycle touring trip I would consider a solar panel charging solution. 10 - 20W is a lot more than 3, and will keep charging after you stop, so long as the sun shines. -- JS |
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