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12

The main advantage, in my view, is that you can more easily add/remove battery-powered lights. Why this may be desirable: Theft resilience. I take my lights off the bike and carry them with me if I'm parking my bike outdoors for longer than a few minutes. Caveats: This can be more of a downside than a benefit, depending on your situation. (I can't imagine ...


11

Cheaper, easy to fit, more widely available - and don't take any effort! Probably most people's memory is of the side wheel dynamo systems when they were a kid that wore away tires, put out a feeble light and turned off when you stopped.


8

Some disc-brake specific wheels use rims that are not designed for rim brakes. To accomplish what you want you need a wheel with a a disc-brake hub and a rim-brake rim. With that setup, assuming the fork widths are the same, you should be able to switch wheels between bikes without problems. The only drawback is the slight increase in rotating mass from ...


7

You should replace the rear wheel only if there is another well justified reason to do so, but generally both wheels are mostly independant, so you can perfectly change only the front. The first scenario I think of is where you are changing only the front hub (and spokes) and keeping the front rim. Why would you change the rear one? Easier task is to ...


7

i have been using the Supernova e3 Triple for night-time singletrack missions for the past two winters.....all I can say is awesome, completely awesome. 870 Lumens. bright. I used a Shimano Alfine dynamo hub and built a complete 'night wheel' with a DT 4.2d rim, it has rubber and a rotor mounted so swap-over time is very quick. We have months of mud, ice ...


6

You might want to look at the Biologic ReeCharge by Dahon. It says it hooks up to any standard dynamo hub. The nice thing about this is that it has it's own battery. So the dynamo changes the internal battery and the battery charges your phone/gps/device. This allows you to change while you are resting, as well as provide added protection against sending ...


5

Taking 100kg of bike plus rider up a 0.3% grade generates a retarding force of 100kg*g*0.003=3N. At 24 km/hr=20/3 m/s that is 20 watts. If that is generating 1A at 5V, the efficiency is 25%. Yes, I picked numbers that were easy to calculate with. But I believe this is all marketingspeak and you shouldn't trust the numbers to an order of magnitude. ...


5

Here's one option: http://h1987995.stratoserver.net/magento/supernova-the-plug-ii-plus-usb-dynamolader.html SUPERNOVA The Plug II Plus USB power supply Transforms dynamo AC to exact USB spec. DC 5V, 500 mA E‐Bike compatible for 12‐ 48V DC with optional cable Works with Garmin, Ipod&Iphone 3GS & 4G & 4GS Seems pretty expensive at €159, but ...


4

I have a Schmidt dynamo hub and it is "maintenance free". It uses sealed cartridge bearings so there is nothing to grease. The Shimano hub probably has a similar design?


4

Tyre driven dynamos can slip in rain or sleet. Hub dynamos can't slip, but do have a tiny amount of drag even when turned off. For a commuting bike, it's not enough to worry about, but on a high performance bike that you hardly ever use in the dark, with battery lights you don't have any drag from something you aren't using (and can leave them at home if you ...


3

Briefly: 1) yes, you can re-use the existing rim. 2) yes, you could shorten the existing spokes, but that would be expensive and foolish. 3) The installation is the same except now you have wires so you need to plug them into the hub too. The main issue is (2). Spokes are usually only reused when the rim is being replaced with an identical rim (usually a ...


3

Typically you need to purchase a light designed to work with a bicycle dynamo due to the power characteristics of a dynamo (lights need DC current). A well sorted hub dynamo (I personally have had great luck with Schmidt hubs) can produce up to about 6W of power depending on your speed and the design of the hub, which is a reasonable amount of power to work ...


3

The easiest way would be to use a low-dropout voltage regulator. You SHOULD regulate the voltage to a stable 5 volts anyway, because you can hurt some electronics by providing them lower voltage than the expected 5. That being said, you can't just go get any old voltage regulator, because most have a dropout voltage of 2v - 2.5v above their target, meaning ...


2

Since it is an halogen light (correct me if I'm wrong), there is a socket inside, with a spring or something, where you "screw" the lamp. Maybe the spring got weak, there is some rust, or some other sort of bad-quality electrical connection. Since the lamps are meant to be replaceable by the user, you could do it yourself perhaps without any tool, or ...


2

The common Shimano Dynamo hubs don't actually use sealed cartridge bearings, see the DH-3N71 and DH-3D72 techdocs. Shimano dynohubs do use good seals, however, and should hopefully be maintenance-free for many thousands of miles. Alistair Spence has a good exploded view of an Alfine DH-S500, which is very similar to the DH-3D71. He also links there to a ...


2

I suspect you will find that most of the chargers that run off hub dynamos take this into account. For example, http://www.thinkbiologic.com/products/reecharge-power-pack in the (pdf) manual say: The ReeCharge is charging when the green light on the side of the ReeCharge is lit. NOTE: The green light is only on when the wheel rotates fast enough to ...


2

I found two seemingly solid options for dynamo powered lights suitable enough for night riding. However, I havn't had any personal experience with either, but both claim to be up for the task. SuperNova E3 Triple Exposure Lights Revo Dynamo Mk1 Both of these put out about 800 Lumens and offer a paired rear light which is chained through the front light, ...


2

Short answer: no. Disc brake rims generally don't have a brake track designed for rim brakes, and you will damage the rim quickly. Secondly, your MTB and cross bike may have different wheel sizes to begin with, so the whole plan may be suspect.


2

I have an Origin rear light and I've seen that it can be charged via usb and also have the lights on at the same time. If you want to have it powered by a Dynamo, what you could do is have the Dynamo connected to it the whole time on the bike and be lighting at the same time. That could be a way to pull it off and never have to take it off. Also, if you ...


2

No mistake - there is no standard. 50% of the time the strip is -ve, 50% positive. Get a multimeter - $10 for a cheapy, and remove any guess work.........


2

Staying lit while totally stopped, for example at a junction, is a function of the light. It's definitely worthwhile, and a modern LED dynamo light with standlight function will give reasonable light for quite a while when stopped. Theft of dynamo lights seems to be rare, but if you are worried, consider using non-standard screws or bolts to make it harder ...


2

The main point of failure, and in my opinion the largest disadvantage of dynamo vs battery lights, shared by both hub dynamos and side wheel dynamos is: wiring. The wiring on a bicycle is often very fragile, and in my experience it is always the first thing to break on any bike. This is especially true if you park in a bicycle parking area where your bike ...


1

The Shimano hub dynamo bearings on one side probably not so difficult and you can look at their drawing but on the other side it can be difficult. I haven't tried to open the other side but you can check this out: http://www.bikeforums.net/archive/index.php/t-700163.html


1

Recently my Lumotec IQ Cyo T senso plus powered by Shimano hub DH-3D30 also started flickering in the same way as you described after I rode in severe cold (-20C). Your lamp is very similar to mine. Initialy I suspected hub, but your hub is different. However we both have Lumotec LED lights and used them in frigid temperatures. This makes me think that the ...


1

Like I suggested above, it's very likely that the problem is due to the sliprings in the dynamo. Unfortunately, the SON hubs do not admit to being serviceable.


1

The main advantage of the bottle dynamo is that it introduces zero drag when not engaged. Bicycle Quarterly did an analysis of the drag from dynamos and a bottle dynamo back in 2005. Note that the bottle dynamo was internally capped at 6.2V, but otherwise is only slightly less efficient (in terms of drag) than the hub dynamos up to around 30kmh. Of ...



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