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  1. #1
    Got an old Peugeot kipibenkipod's Avatar
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    Internal gearing in the BB

    Hi,
    Is there a gearing system like rohloff, but for the bottom bracket?

    Thanks,
    Kfir
    On the bike I feel like a conqueror ;)
    4 months touring trip from England to Spain http://www.underadometent.com

  2. #2
    Senior Member Speedo's Avatar
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    Something like this one by Schlumpf?

    Speedo

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    Got an old Peugeot kipibenkipod's Avatar
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    Thanks for the link.
    This is a good progress, but still you need to have internal gear hub on the back wheel.
    I'm looking for a regular hub in the back with one cog.

    Thanks,
    Kfir
    On the bike I feel like a conqueror ;)
    4 months touring trip from England to Spain http://www.underadometent.com

  4. #4
    Acetone Man
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    Kfir,

    Something similar to what you want can be found in a few exotic freeride/downhill mountain bikes, such as the GT IT-1, Honda RN-01, and Nicolai Nucleon. But if you're looking for a touring bike, this really isn't what you want.

  5. #5
    Got an old Peugeot kipibenkipod's Avatar
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    Hi,
    I have seen those, but they are heavy and just 7 speeds.
    It looks like they will survive after we fade from the planet
    I said Rohloff because its very lite compared to those gearboxes, and also have 14 speeds.

    Thanks
    On the bike I feel like a conqueror ;)
    4 months touring trip from England to Spain http://www.underadometent.com

  6. #6
    rhm
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    multimodal commuter rhm's Avatar
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    Apparently there is/was a five-speed internally geared crankset called a Miyata FM-5 or something; in the folding bikes forum someone posted a Strida that had been modified with one. Very hard to find, at any rate.

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    Acetone Man
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    Kfir, the Nicolai uses a rohloff as the gearbox. Also requires a proprietary rear hub for left side drive. Also costs 4800 euro for frame and gearbox.

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    Got an old Peugeot kipibenkipod's Avatar
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    Quote Originally Posted by Thasiet View Post
    Kfir, the Nicolai uses a rohloff as the gearbox. Also requires a proprietary rear hub for left side drive. Also costs 4800 euro for frame and gearbox.
    Yes, now I understand. I saw this thing and didn't bother to read that its rohloff inside.
    This is a nice adaptation of the rohloff hub as a front gearbox.
    This is what I was looking to find, but, hehe, maybe 1/10 of the price
    But it certainly nice to see people adapt known technology and use it differently then intended.
    Why does it weights 6.3 kg? My guess it related to downhill where everything should be very stiff.

    Thanks,
    Kfir
    On the bike I feel like a conqueror ;)
    4 months touring trip from England to Spain http://www.underadometent.com

  9. #9
    Got an old Peugeot kipibenkipod's Avatar
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    Quote Originally Posted by kipibenkipod View Post
    Yes, now I understand. I saw this thing and didn't bother to read that its rohloff inside.
    This is a nice adaptation of the rohloff hub as a front gearbox.
    This is what I was looking to find, but, hehe, maybe 1/10 of the price
    But it certainly nice to see people adapt known technology and use it differently then intended.
    Why does it weights 6.3 kg? My guess it related to downhill where everything should be very stiff.

    Thanks,
    Kfir
    Well, now I understand that 6.3kg is for the frame and the gearbox together.
    I wonder what is the weight of the gearbox itself.
    On the bike I feel like a conqueror ;)
    4 months touring trip from England to Spain http://www.underadometent.com

  10. #10
    Got an old Peugeot kipibenkipod's Avatar
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    My intentions when I asked for gearbox like this, was, that it will let the rear wheel be lite without the rohloff hub inside. Also stronger. Was that the intention in the design of the Nucleon?
    Thanks,
    Kfir
    On the bike I feel like a conqueror ;)
    4 months touring trip from England to Spain http://www.underadometent.com

  11. #11
    Got an old Peugeot kipibenkipod's Avatar
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    Ok ok, hehe
    People did think about this concept before and also went forward to standrize it
    http://www.g-boxx.org

    Regards,
    Kfir
    On the bike I feel like a conqueror ;)
    4 months touring trip from England to Spain http://www.underadometent.com

  12. #12
    cyclopath vik's Avatar
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    Quote Originally Posted by kipibenkipod View Post
    My intentions when I asked for gearbox like this, was, that it will let the rear wheel be lite without the rohloff hub inside. Also stronger. Was that the intention in the design of the Nucleon?
    Thanks,
    Kfir
    How would the rear wheel be stronger without the Rohloff? A Rohloff wheel has shorter spokes and is not dished which is the equivalent to a 36H/40H dished wheel. People use 32H Rohloff wheels on touring tandems which has to be a pretty brutal application for a bike wheel.
    safe riding - Vik
    VikApproved

  13. #13
    Got an old Peugeot kipibenkipod's Avatar
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    Quote Originally Posted by vik View Post
    How would the rear wheel be stronger without the Rohloff? A Rohloff wheel has shorter spokes and is not dished which is the equivalent to a 36H/40H dished wheel. People use 32H Rohloff wheels on touring tandems which has to be a pretty brutal application for a bike wheel.
    I do respect the way things are developed. But now
    rohloff hub make the wheel heavy.
    It should be in the crank or above like gbox, and let the wheel be lite.
    Also then, you will be able to run the belt drive above the crank/chainstays and avoid the opening of the frame for replacing belt.

    Kfir
    On the bike I feel like a conqueror ;)
    4 months touring trip from England to Spain http://www.underadometent.com

  14. #14
    cyclopath vik's Avatar
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    The difference in weight of a Rohloff wheel and a Shimano hub/cassette/der is about 1.75lbs. I'm not sure I could tell the difference on a touring bike - especially once loaded up.

    Another thing to consider is that my keeping the gearing in the hub you can quickly move the Rohloff to a 2nd or 3rd bike in minutes by just buying an extra shifter. I'm doing that and it means you suddenly get a whole lot more for your $$$ if you can run two bikes with the same Rohloff.
    safe riding - Vik
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  15. #15
    Got an old Peugeot kipibenkipod's Avatar
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    Quote Originally Posted by vik View Post
    The difference in weight of a Rohloff wheel and a Shimano hub/cassette/der is about 1.75lbs. I'm not sure I could tell the difference on a touring bike - especially once loaded up.

    Another thing to consider is that my keeping the gearing in the hub you can quickly move the Rohloff to a 2nd or 3rd bike in minutes by just buying an extra shifter. I'm doing that and it means you suddenly get a whole lot more for your $$$ if you can run two bikes with the same Rohloff.
    I agree with what you say.
    I think you didn't understand what I said.
    Its a single speed hub at the back and have the rohloff in the crank or somewhere near.
    Apperently this was thougt about here: g-boxx.org Techtalk/FAQ's page
    If this concept can be cheap, this is a great option for touring bike.

    Oh, and again, the concept of sharing rohloff wheel between frames is good, and the g-boxx concept will not have it.

    One other thing. Rohloff should be in g-boxx. Its better for a part that cost 1200$. Also it shouldn't be also a hub. Divide and concur. Rohloff will be gearbox and the hub will be a hub. Much better.
    Last edited by kipibenkipod; 12-16-08 at 11:23 AM.
    On the bike I feel like a conqueror ;)
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  16. #16
    cyclopath vik's Avatar
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    Quote Originally Posted by kipibenkipod View Post
    I agree with what you say.
    I think you didn't understand what I said.
    Its a single speed hub at the back and have the rohloff in the crank or somewhere near.
    Apperently this was thougt about here: g-boxx.org Techtalk/FAQ's page
    If this concept can be cheap, this is a great option for touring bike.

    Oh, and again, the concept of sharing rohloff wheel between frames is good, and the g-boxx concept will not have it.

    One other thing. Rohloff should be in g-boxx. Its better for a part that cost 1200$. Also it shouldn't be also a hub. Divide and concur. Rohloff will be gearbox and the hub will be a hub. Much better.
    I think I am understanding you, but I don't see the advantage of trying to stuff 14 gears into the BB area and I don't understand how that would be any cheaper than a Rohloff. Ultimately if you want a wide gear ratio transmission you are going to use the same parts regardless of whether they are in the BB or a hub so the cost will be the same. Since the Rohloff is a proven product with a track record for touring applications it doesn't seem like there is a lot of motivation to change to something else that is unproven unless there are significant benefits.
    safe riding - Vik
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  17. #17
    tcs
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    If you go back to the formative days of bicycle gearing, 1900 to WWI, you'll find a number of bottom bracket multi-gear schemes. They lost out to internal gear hubs because they were on the wrong side of the speed ratio/torque multiplication and had to be stronger (larger, heavier, more expensive).

    tcs
    "When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.

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