Internal 3 speed wheels (Hubs)

Discussion in 'Hubs, Gearboxes, Sprockets and Chains' started by RedB66, Apr 15, 2010.

  1. BarelyAWake

    BarelyAWake New Member

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    Yer right... but so long as the rear wheel's RPM exceeds that of the drive chain it's essentially one and the same, in fact with a "dead stop" of the chain, the hub may not shift at all - the important thing is to not shift under load.
     
  2. silverbear

    silverbear The Boy Who Never Grew Up

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    So is this kind of like when we used to have non syncromesh manual transmissions on cars and trucks? I can also remember shifting gears without benefit of a clutch when it no longer worked and you had to kind of feel the gears and slip it in when the rpms were right. Anything like that? I'm thinking real hard about a shift kit. I think it is something I'm just going to have to do. Between having hills to deal with and eventually a sidecar, I think gears are going to be a must. Prepare to have your brains picked, Barely, and I'm going to be asking your advice on the suitability of one frame over another of what is available to me. It will be vintage, but don't know which one yet... maybe a 34 Elgin like the one in my avatar that burned and maybe the 50 Panther. Either one would be awesome with an sbp shift kit and a PK-80 powering it. Gotta be sure it will fit. Boy, that's something to dream on.
    SB
     
  3. BarelyAWake

    BarelyAWake New Member

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    To be honest silver - I'm new to internally geared hubs and after lookin' at some cutaway views - they confuse and terrify me a bit, including a 4th dimension there's far more inside that would possibly fit back in should ya dare take it apart lol (actually, I'm waiting to get my hands on a junk one to experiment with).

    [​IMG]
    Sturmey-Archer Bicycle Hubs... and that's just a 3 speed O.O


    Yet they've worked for years and mine is doing well with the shiftkit - I'll be more than happy to help with what I can, I will say it'll be a challenge indeed to find a step-through frame that's perfect for a shiftkit... perhaps not - but you'd know the clearances better than I ;)
     
  4. camlifter

    camlifter Active Member

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    i'm using the old 70's shimano 3sp as a jack shaft in the silver bike, so it sees a lot more rpm than it would if it was in the wheel, so far it's held up great, i shift it under power all the time, dosen't seam to hurt it, only thing i watch out for is down shifting to soon, if you shift to first while going 15 mph the motor will over rev when you kick in the clutch, even shifting down to 2nd can rev it up if your going to fast.
     
  5. silverbear

    silverbear The Boy Who Never Grew Up

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    I'm going to have to go back to your build thread to look at that more closely. I can't remember what frame you used for that build and at the time wasn't quite so enthused about a jack shaft shifting setup, not really understanding what it could mean for a better ride. Now I have just enough understanding to want to experience it for myself. Do you have the link for that thread?
    SB
     
  6. camlifter

    camlifter Active Member

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  7. silverbear

    silverbear The Boy Who Never Grew Up

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    Barely,
    I'll have to stare at your build some more when I have time. I hadn't realized that a step through would be a problem. I kind of like that 34 Elgin the best, but there is a lot going on there anyway with the skirts and big chainguard. Maybe the Panther would be a better candidate. I started using step throughs when I was more crippled up after the lightning strike and consequent Guillane Barre Syndrome nerve damage. Since then I've better mastered using my upper legs to compensate for the spotty nerve connections at the feet so that most people don't even know I'm kind of cripped. So, I'm a little more coordinated now at getting a leg over the rear of a mens bike. In short, I could make the Panther work for me although the step through bikes are easier to mount. Something will work and when the time comes your counsel will be much appreciated.
    SB
     
  8. BarelyAWake

    BarelyAWake New Member

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    I'm by no means sure that a step-through wouldn't work, just that it would need extra consideration... the engine may be mounted higher than a men's bike, but that may be an advantage actually (clearing the jackshaft/crank chain & the engine case).

    Hmm... I've not really taken pics with the shiftkit itself in mind... well, here's a couple that sorta help (notice vertical clearance) - if ya want more w/measurements I'll be happy to take them, these are kinda outdated anyway heh

    [​IMG] [​IMG] [​IMG] [​IMG]

    ...and here's a link to just the album if ya want: Rollfast pictures - Photobucket
     
    #28 BarelyAWake, May 12, 2010
    Last edited: May 12, 2010
  9. silverbear

    silverbear The Boy Who Never Grew Up

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    Camlifter,
    That's a slick setup you devised with very admirable skills I lack. It's good to hear that everything is holding up and that you're happy with it. That must be a very great satisfaction to ride along on a bike whose drive train you thought up. Very cool!
    SB
     
  10. noisydad

    noisydad New Member

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    WOW - talk about thinking outside the box!
     
  11. BarelyAWake

    BarelyAWake New Member

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    I like that setup, enough that I tried to talk a friend into doing that on his OCC, but after some discussion decided Russell's http://motorbicycling.com/f3/integrated-motor-mount-jack-shaft-12284.html suited his style, he's gonna pound on it and wouldn't invest in a quality hub. He's got a ton of scrap 21sp bikes for parts so it makes sense.

    Still, if I were to do a shifter chopper I'd prolly try your route, particularly with a four stroke. I like how the hub is standalone, prob makes for less adjustment needed and simplifies maintenance and repair as it's not part of the rear wheel *shrug* You'd know better than I tho lol
     
  12. camlifter

    camlifter Active Member

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    i think using the hub as a jack shaft would only be practical on a 4 stroke, then you have the gear box out put shaft to extend over and then jack shaft back to the left side with the hub, on a 2 stroke it would take a jack shaft plus the hub as a jack shaft, double the fab work, for a 2 stroke it's probably best to put the hub in the rear wheel.
     
  13. TheSignGuy

    TheSignGuy Member

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    Did you use a hub adapter to fit the rear sprocket on the nexus 3?

    Minus jacks shafting conversations, I have the nexus 3 700 x20 rims.
     

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