Questions tagged [dynamo]

A dynamo converts mechanical energy to electrical energy.

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9 votes
2 answers
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Advice on hub-driven rear lights

I've had my Cube Travel Pro for a few years now, and it's been well used in all sorts of weather (it's my commuter so it's covered in road gunk). It has hub-powered front and rear lights which has ...
kabdulla's user avatar
  • 307
8 votes
3 answers
1k views

DIY system for charging battery packs from hub dynamo

recently I stumbled over an interesting feature of a bike. The gravel bike from Decathlon has an inbuilt USB hub where you can charge your battery packs while riding. Now I wonder if there is a way to ...
Hagenbeck's user avatar
4 votes
1 answer
127 views

Problems installing front and rear Busch and Muller dynamo lights to a shimano hub dynamo

I connected the Front Dynamo Light (Halogen Busch & Muller Lumotec Oval Senso) to the Shimano hub dynamo and it worked fine. I then connected the Busch & Muller D Toplight Plus Rear Carrier ...
Bryn's user avatar
  • 41
8 votes
1 answer
917 views

Dynamo hub lights flickering: should I be concerned?

I've gotten some new lights for my bicycle this Christmas and just bought a matching dynamo hub wheel for them. I've removed my old wheel and put the new wheel in the fork and attached the lights just ...
Daniel Baulig's user avatar
0 votes
0 answers
98 views

Brompton Dynamo Light Stopped Working

My Brompton Dynamo light has been working perfectly since I got the bike about 8 months ago (the model is ‘Brompton spanninga dynamo tprbi06033’) however a few days ago when I changed the way it was ...
Jacob Marks's user avatar
5 votes
2 answers
851 views

Do hub dynamos with higher power output exist?

I know there are dynamos with 3 W as the highest output, but are there commercial dynamos available with even better effect? See, I don't mind pedaling with a bit more drag if I can get better ...
MiNiMe's user avatar
  • 151
1 vote
2 answers
145 views

On the quick release disc version of the Son 28 dynamo, should my fork sit on top of the hub axle or directly on the wrong skewer?

Should my fork sit on top of the axle of the QR version of the son 28 disc hub or should it sit next to them on top of the QR axle?
Luke Zareba's user avatar
5 votes
3 answers
97 views

Best type/designation of 2-strand wire to buy in bulk for generator and ebike lights

As a US-based shop mechanic, every time I try to buy 2-strand wire that can do the same things as what comes with generator and ebike lights, it gets deceptively complex. A lot of what's out there ...
Nathan Knutson's user avatar
2 votes
1 answer
88 views

What dynamo hub wheel do I need?

I've bought myself a little city bike a few months ago and since we're now approaching winter months I will need to install some lights to ride in the later hours. I've been toying with the idea of ...
Daniel Baulig's user avatar
2 votes
4 answers
266 views

Front and rear lights not working properly when both connected to dynamo

On my bike I have a bottle dynamo rated at 6V 3W. It has two connectors, + and ground. My front light is an AXA lamp that I'm not sure of the model, but is very similar to an AXA Pico 30. It has a ...
IceCreamFan21's user avatar
3 votes
1 answer
189 views

Checking dynamo-wire contact

After my front wheel got damaged I took it to the BS where I purchased it and they replaced it. However, after riding it I have noticed that with the new wheel the dynamo hub (Shimano Nexus) works ...
L.Dutch's user avatar
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2 votes
2 answers
421 views

Dynamo light with replaceable cables

I am looking to buy some new dynamo lights because the (halogen) front light which came with the bike is not bright enough. I have a 2.6W dynamo and was looking at the B&M IQ-XS and the B&M ...
Jan-Pieter's user avatar
17 votes
4 answers
5k views

Is there a benefit to turning off dynamo-powered lights?

I have a bicycle with lights and a hub Dynamo. I am looking for generic answers that apply to more setups but if that's not possible, the bicycle I have is a Stevens Randonneur 2021. My bicycle lights ...
Rabee's user avatar
  • 293
1 vote
1 answer
92 views

Communication with electric and bluetooth wheel (imortor)

I would like to know about the specs, standard or protocols to communicate through Bluetooth with the controller embedded in the wheel. By default the wheel can be managed through BT with a very poor ...
Daniel Perez's user avatar
3 votes
1 answer
135 views

Front light has no cable to connect the rear light

I bought a Eyc T plus front light for my bicycle. I then realised that the light is missing a cable outlet for the rear light (a in the picture). How do I make the rear light work. Do I simply try to ...
Stücke's user avatar
  • 1,446
2 votes
1 answer
529 views

Does direction of rotation matter for dynamo hubs? [duplicate]

I'd like to install a dynamo hub in a trike application where it will spin "backward" compared to how it would spin on a normal bicycle (I can't turn it around because I need the disc brake ...
BetterSense's user avatar
  • 3,356
2 votes
1 answer
750 views

Dynamo Rear Light Problem

UPDATE Dear All, thank you for replying. Very helpful information in there. I have taken more photos as requested. Some answers to the questions, in order of comments. I tried to draw a wiring ...
daveinberlin's user avatar
21 votes
15 answers
4k views

What applications exist for bicycle power, besides propulsion? [closed]

The dynamo light uses the power of a bicycle and rider to generate light. Are there other such inventions, intended either as accessories to the bicycle, or intended to be powered by bicycle mechanics ...
SamA's user avatar
  • 2,696
9 votes
1 answer
1k views

Output of a Hub Dynamo measured with an Oscilloscope

What signal do you get from a hub dynamo when measuring it's output with an oscilloscope. Please include information on load and setup.
gschenk's user avatar
  • 9,660
4 votes
3 answers
1k views

Which model of hub dynamo does the Cube Nuroad Race FE have?

I own a 2020 Cube Nuroad Race FE bike. Do you perhaps know what model of hub dynamo this bike has or at least if it's AC or DC? I can't figure it out since there are no markings on it. Here are a few ...
Dusan's user avatar
  • 41
7 votes
1 answer
789 views

Spokes bow out from the hub flange

Wheel building using a SON Dynamo hub (28 12 disc), Wheelsmith DB14 spokes (stainless; J-bend), and Velocity Atlas rims (700c; 32 hole) with a two-cross lacing pattern. Disc brake, loaded touring. The ...
Laoshi's user avatar
  • 739
1 vote
1 answer
397 views

Replacing a "simple" hub with a dynamo hub

I asked a question recently about replacing a cracked front hub on a vintage steel wheel (How to replace a broken front hub on a vintage steel wheel from a vintage steel bike?) Thanks for all the ...
HSH's user avatar
  • 95
9 votes
5 answers
6k views

Can I safely drill a hole from the crown into the steerer in my carbon fork?

I want to install dynamo-powered USB charging apparatus inside my fork steerer. However, it's a carbon fork that has no exit at the crown for the dynamo wiring. Is it safe to drill a small hole (at ...
Will Vousden's user avatar
  • 3,981
1 vote
0 answers
195 views

Shimano Hub automatically switches off while riding

I have few Shimano dynamo Hubs and I had to face this issue on several: they seem to be on good working condition. I checked them on a truing stand with a light and they worked fine. Then when I start ...
BlackBoris's user avatar
2 votes
1 answer
666 views

How should I finish the dynamo cable connection from SON coax to an SP connector?

Connecting a SON coax cable to an SP (Shutter Precision) Dynamo "lego brick" results in exposed wire. How should I protect this and tidy it up? Second question: how do I know the wires have ...
sdgfsdh's user avatar
  • 887
0 votes
1 answer
725 views

Experience with Panasonic Dynamo hubs?

I'm starting to spec out a dynamo hub wheel build for light touring/randonneuring. Was planning on going with a Shutter Precision hub, but just stumbled on these Panasonic hubs on sale at Soma for $21....
MikeyC's user avatar
  • 640
1 vote
2 answers
407 views

Can you run a quick release skewer with a SON dynamo hub?

Regular SON dynamo hubs come with a hex key skewer rather than a QR. That's not a big deal, but it's probably simpler for the other 2 riders on the household who are running these hubs to deal with a ...
user avatar
3 votes
1 answer
200 views

what is this hole for on a B&M Luxos U light?

Installing a luxos U. I've got a pair of others on other bikes, but those were installed by an OEM in Europe. The process is straightforward: Crimp some spade connectors on, then connect hub to light ...
user avatar
3 votes
3 answers
357 views

Does asymmetric rim go with dynamo hub?

I'm building a dynamo hub wheel. I see there's symmetrical and asymmetrical rim and not sure which one I should go with. I'm using son dynamo 28 if that makes difference. My front wheel has SRAM ...
eugene's user avatar
  • 599
0 votes
2 answers
588 views

How does dynamo hub feel at hand?

I am 100% new to the dynamo world, and after unpacking it I was surprised how it behaves. I already googled and found out that some of my worries are "normal", but for some of the issues ...
greenoldman's user avatar
  • 2,064
0 votes
1 answer
174 views

Dynamo, Difference between trans am and tour divide

Mike hall used dynamo on his tour divide record. He didn't use dynamo on his trans am record. What would be the differentiating factor to use or not to use dynamo? My guess is that trans am route ...
eugene's user avatar
  • 599
4 votes
4 answers
3k views

What gauge wire is used for dynamo hubs and lights?

I have some non-standard bikes to hook up so rather than ordering the kits with fixed length wires, I want to just order appropriate double strand (or coaxial) wire in bulk, along with the connectors, ...
user avatar
4 votes
1 answer
327 views

How do you repair or lengthen a B&M Luxos Control Cable?

Maybe this would be better off in electronics, but since it's bike gear specific, I thought I'd try here first. I need to have longer control cables on B&M's Luxos U headlight/charger combo. This ...
user avatar
0 votes
2 answers
344 views

Aluminium front and carbon rear wheel on hardtail?

I recently got a used hardtail MTB. (Specialized Epic Elite) It's got Roval SL Control 29 - which is pricey. The front has 24 spokes and back has 28 spokes. Now I want to install a dynamo on it and ...
eugene's user avatar
  • 599
2 votes
1 answer
529 views

How to install dynamo hub into mtb

I have a roval carbon wheel on specialized epic hard tail. I want to install son dynamo hub on it. I've seen it done on https://bikepacking.com/plan/lael-wilcox-2019-tour-divide-gear-list/ (SON 15mm ...
eugene's user avatar
  • 599
3 votes
2 answers
794 views

Rear stand light on a Cube Nuroad FE not working

I bought online a Cube Nuroad Race FE 2021 that comes full with fenders and dynamo lights. The front light is the Supernova E3 Pure and, although not stated clearly on Cube's site, the rear light ...
Kostas's user avatar
  • 151
1 vote
1 answer
764 views

Running multiple dynamo lights on a single dynohub

I have a Shutter Precision PD8 hub, and a B&M headlight. I happen to have a spare B&M headlight of a different model in my parts bin. I'm thinking about putting the second light on just to ...
BetterSense's user avatar
  • 3,356
7 votes
4 answers
1k views

Will running an LED designed for batteries on a NEXUS dynamo hub damage the LED?

I have a question about LEDs on 6V Shimano dynamo hubs. I built up an old Schwinn with a Nexus dynamo hub, and the headlight I'm using is based on an LED 6V headlamp. The LED is a Chip-on-board design,...
Steve Close's user avatar
7 votes
2 answers
793 views

Are dynamo hubs specific to particular lights?

I am looking to purchase a dynamo hub, such as those made by Shimano, Son, Exposure etc. and a set of lights to connect to it. What I want to know is if any dynamo light will work with any dynamo hub, ...
sdgfsdh's user avatar
  • 887
1 vote
3 answers
760 views

Can any dynamo hub get the electricity rotating with the spokes?

I want to make wheel LEDs powered by a dynamo hub. I was wondering if that's even possible. Any ideas or models?
ofou's user avatar
  • 121
1 vote
0 answers
99 views

Differences between Shimano DH-T670 and DH-3N72 dynamo hub?

Despite the cutouts in the hub flange, are there any differences? Different sealings or different races?
user430's user avatar
  • 733
2 votes
1 answer
5k views

Will a front wheel with 24 spokes be strong enough for a total load of ~100kg?

I want to build a wheelset for my Adventure/Gravel Bike based on the DT Swiss GR 531. I want to use my SON Delux Dynamo Hub. Since it is for 24 Spokes I am thinking of mount the rear wheel with 28 ...
ruedi's user avatar
  • 779
0 votes
1 answer
1k views

AXA bottle dynamo noise

I'm looking for advice on AXA HR Traction bottle dynamos and others like it if there are any, as I have seen others on this forum discuss them specifically on other threads. My partner is running it ...
djuna_moon's user avatar
4 votes
1 answer
369 views

How can I spin a dynamo wheel at road speed for bench testing?

I can check my dynamo works by spinning the wheel on the workstand or just riding, but I'd like to do some more involved testing. I'd like to develop some custom electronics to use the extra power ...
Chris H's user avatar
  • 58.9k
11 votes
6 answers
5k views

Just how bad are bottle dynamos?

My tourer has a dynamo front wheel, which is great. It's so handy* that I ended up using it for most of my commuting over the winter, despite having a hybrid that should serve as my foul-weather ...
Chris H's user avatar
  • 58.9k
1 vote
5 answers
1k views

How to choose the light bulbs for a given dynamo

I have a 16V 8W bottle dynamo and two light bulbs: one is marked 6V 0.05A and is working properly other does not have any inscription and ceased to work. I would like to replace the second light ...
Pedro Rolo's user avatar
2 votes
1 answer
599 views

What kind of nut is used on Shimano hub dynamo with rollerbrake?

I tried using the normal cap nut that is also used for my Shimano internal gear hub on my back wheel. The issue I have is that the axle on power side is quite short and the nut does not get enough "...
fvclaus's user avatar
  • 305
6 votes
1 answer
352 views

On fitting 700C rims to a dynamo hub rated for up to 20"

I am currently in the planning stages of creating a really fancy front fork for my bike. For a little background, I want to try to get this custom built Burrows monoblade with disc mount: https://...
user40052's user avatar
6 votes
1 answer
170 views

Dynamo cutting out after a couple of seconds

This sounds like I've an electrical issue, but no idea of next steps. I have a Gazelle Tour Populair with what I believe is a Busch & Müller LYT Lumotec Retro front dynamo-powered light. When ...
eoinoc's user avatar
  • 319
3 votes
3 answers
3k views

Replacing a normal hub with a dynamo hub

I'm the owner of a Kona Sutra 2017. I'm pretty happy with this bike, but I'm looking to get a dynamo hub for it, with some lights and maybe a charger for my phone. So far I managed to figure out that ...
Allan Kimmer Jensen's user avatar