Best Front Brake Hub with 6 volts for your lights

Discussion in 'Electrical' started by birdmannn101, Jul 18, 2012.

  1. birdmannn101

    birdmannn101 Member

    Jim (Og-whizzerdude) came up with a suggestion to get our PM to a thread when I asked him about wheels. I thought it was a great idea so here it is.

    I just bought the best brake hub for my Beach Cruiser that I could find. Loquin suggested a Sturmey Archer X-FD which is 70mm and sells for $80. After researching the Archer site I found the XL-FDD for $86.40 which is a 90mm hub (better stopping power) and comes with a 6 volt 2.4 or 3.0 amp generator to hook up headlights, tailights or whatever. The 26" Huffy wheel will need shorter spokes (90mm hub) so I asked Jim who he knew that laced wheels. He suggested Guy Doss who's email address is

    Guy has a website here.

    Guy said he could do the wheel for $85 ($40 for new spokes and $45 labor).

    The hub had good reviews except two "real bikers" said it weighed more than they planned. It only weighs 1350g but heck, they gripe about the weight of a jack or speedometer too...LOL

    The Archer website is located here ...... Dan

  2. BigBlue

    BigBlue Active Member

    The XL-FDD is 2.4 or 3.0 Watts.

    AKA: BigBlue
  3. birdmannn101

    birdmannn101 Member

    Mine is 3.0 watts and I ordered it from Tree Fort Bikes.

    I pressed "Instant Price Match" and used Amazon's $86.40 to bring the price down from $99.99 and bought it for $86.40.
  4. Huntington

    Huntington Member

    How well does it hold up to motorized bikes?
  5. chainmaker

    chainmaker Member

  6. Huntington

    Huntington Member

    Im thinking it would be best to use this hub to charge a battery. That way the light output is constant regardless of the rpm/current output. Then any light can be used. I like it, and as it happens I do Have a $100 amazon gift card to spend.
  7. birdmannn101

    birdmannn101 Member

    Well my hub is costing me $90 to change out the standard hub, lace this dynamo hub into the front wheel with #12 spokes. I had larger #11 spokes which look like motorcycle spokes which I wanted to keep but they wouldn't fit ito the holes on the hub so they had to buy new spokes. The hub says that it only fits #13 an #14 spokes but I think that is too small for a front hub brake wheel. A 6 volt battery eh? Well, looking back on my old motorcycle restoration days I think you would need a tad more voltage, maybe 7 or 8 volts to charge the battery.
  8. Huntington

    Huntington Member

    Im an electronics guy, going to Cal Poly for Electrical Engineering. 6 volts will be fine, a small circuit can boost it to 12 but for charging a battery 6 will work. The trick is keep the current stable and convert it to DC. I would use a 12 or 14f dc battery.
  9. birdmannn101

    birdmannn101 Member


    That is great having someone here who is really into electronics. Your saying "6 volts will be fine" means a 6 volt battery, right? Why would you use a 12 volt battery to supply power to 6 volt bulbs? It is hard to keep the current stable on a dynahub. I heard that 3 to 5 total watts of lighting should be used with 6 volt dynamo. Is this true? Which one of these batteries SLA, NiMh or Lithium Ion would be the best?

  10. Huntington

    Huntington Member

    Well I personally have a 14.4 v LifPo4 battery. It kicks butt but may not be the best. Charging a Lithium takes more electronics then charging a SLA or NiMh. For a motorized bike a simple SLA is fine. I like 12 volts but a 6v battery can power a lot of things. You don't need to match the voltage output of the hub to the voltage of the battery but you need to pay attention to the battery requirements. It would be more effective to use the hub as a charger. During the day you may not need to power a light, but you still ride, so why not store that power into a battery for latter use. At night when you use your light, its powered by nice clean DC voltage, at a constant current, from the battery. It sounds like magic but you can take 6Vac and turn it into 12vdc, as long as you dont require more then the 3w the hub provides, everything should be fine. **** a few high power LEDs can light the way and run off 5vdc. Just remember, the higher the voltage, the less current required. So if you use a 12 volt system, your battery should last longer and be more useable then with a 6 volt system.

    I ramble.. but as to your question, If your driving the light directly from the hub, you would want to go with at least a 3watts light, if the dynahub is rated at 3w. You can go bigger on your light but not smaller. If you get less then 3w light, then when your hub is operating at maximum and producing 3watts, you will burn out your lights. A 5w light would be best, you loose some light intensity but insure you wont burn it up. However, this problem is prevented using the battery method I described earlier.
  11. birdmannn101

    birdmannn101 Member

    Thanks for all that information Huntington. Where would I be able to pick up a battery for my 6 volt 3 amp hub?
  12. pbeggs

    pbeggs Member

  13. birdmannn101

    birdmannn101 Member

    Thanks pbeggs, I have been looking at that along with the AA rechargeable batteries for the main battery. Do you have one of these chargers? How well does it work on your bike? Do you use LED lights on your bike?

  14. pbeggs

    pbeggs Member

    i have one of the charger units with coil on my engine, the charger module would be the same for your hub,.. it keeps a 1 amp-hr battery charged (sla)
    the led lights i have 2 of the 2 led models,.. very bright,.. can run them 3 hours off the battery without the motor running,..

    your hub will charge a 6 volt battery well esp on a motorized bike as the faster you go the more power the hub makes,.. what ever you do you will need something to regulate the output from the hub as it will burn out most lights at mb speeds (a battery will soak up all the excess and save it for when you are stopped )

    your hub puts out alternating current and MUST be converted to dc before charging a battery the wonderful creations module will do that for you,..
  15. Fabian

    Fabian Well-Known Member

    Would it not be better to simply attach a "Wonderful Creations" 12 volt lighting system with rectifier and regulator and 2,500 mAh NMH battery or a 4,000 mAh Lithium battery included in the deal, that also comes with a 12 volt accessory output socket.
  16. pbeggs

    pbeggs Member

    uh,.. he already has the hub i believe, and the 6 volt system will work with that hub. true one could convert 6 to 12 volts (at half the amps) but that is not done by the module that is available.
  17. birdmannn101

    birdmannn101 Member

    So, after all these thoughts from pbeggs and Fabian, which deal would be the best since I already have the hub? Just the charging system with their battery or the whole she-bang?
  18. Fabian

    Fabian Well-Known Member

    If you already have the hub and don't want to give up using that method, then the only option will be to use the hub and make it work as best you can.

    Personally, i would just start from scratch and get the "Wonder Creations" 12 volt lighting system and have it up-speced to my bespoke specifications - it will cost you around $300, but it does the job superbly well, and what a joy it will be to scroll through a back light digital display giving functions such as current draw, charge rate etc, not to mention having decent 12 volt battery capacity to recharge electronic devices is simply a """must have item"""
  19. pbeggs

    pbeggs Member

    fabian, you have a link to the system you are proposing? because i cant find it,...

    i used wc lights and charger module, and coil ,,but you did not specify what motor you have so i didnt go into that
    i used a battery i got elsewhere,..

    if you want to use the hub gen, the 6 volt system will work, i do like their lights,.. the module for charging i have works well,..

    i would buy the led lights and charge module,.. and possibly battery from wc, but in the end it is up to you
  20. Fabian

    Fabian Well-Known Member

    Info coming your way