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Thread: Here's an idea

  1. #1
    Medium?
    Reputation: Fast Eddy's Avatar
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    Here's an idea

    <a href="https://www.nashbar.com/profile.cfm?category=&subcategory=&sku=11246&brand ="><img src="https://www.nashbar.com/nashbar_photos/medium/YW-SNX.gif">
    Shimano Nexus 3-speed Wheelset with coaster brake and shifter, 110mm spacing, $99 at Nashbar</a>

    plus

    <a href="https://www.jensonusa.com/store/product.aspx?i=FR707A01"><img src="https://www.jensonusa.com//store/imgWrapper.aspx?img=/fr/fr707a01.jpg&type=3">
    Redline Monocog and fork, 110mm spacing, $115 at Jensonusa.com</a>
    Last edited by Fast Eddy; 03-18-2004 at 06:21 PM.

  2. #2
    Steamroller
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    Cheater, Cheater

    3 gears would be cheating ( not that I'm above it) and then you would have to think about shifting again.
    Or I guess you could just put it in the best gear for your particular ride. Can it be shifted incognito at the hub, because a shifter on the bars would be a dead giveaway?
    Two Wheeled and Too Big

  3. #3
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    I was thinking of it as a townie bike

    with a fairly big ring on the front, and tall risers. I've seen people who put the grip shifter on the seat tube. It was fairly incognito.

  4. #4
    Cracker-magnon
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    With some of these

    Quote Originally Posted by Fast Eddy
    with a fairly big ring on the front, and tall risers. I've seen people who put the grip shifter on the seat tube. It was fairly incognito.
    REDLINE FORKLIFTER BARS 34.99 at Dan's Comp
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  5. #5
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    Reputation: (Tom)'s Avatar
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    Sounds like a great idea! I ran the nexus 7 speed hub/roller brake for two years of daily commuting. No problems whatsoever in 2+ years of big city North Eastern US year round commuting. They are pretty damn heavy tho...

    Here's all the bike in it's current configuration - all townie bikes need baskets !
    Last edited by (Tom); 03-18-2004 at 07:57 PM. Reason: tpyo

  6. #6
    WWYD?
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    Hey! I'm looking at some of those parts in my living room right now...

    Quote Originally Posted by Fast Eddy
    <a href="https://www.nashbar.com/profile.cfm?category=&subcategory=&sku=11246&brand ="><img src="https://www.nashbar.com/nashbar_photos/medium/YW-SNX.gif">
    Shimano Nexus 3-speed Wheelset with coaster brake and shifter, 110mm spacing, $99 at Nashbar</a>

    plus

    <a href="https://www.jensonusa.com/store/product.aspx?i=FR707A01"><img src="https://www.jensonusa.com//store/imgWrapper.aspx?img=/fr/fr707a01.jpg&type=3">
    Redline Monocog and fork, 110mm spacing, $115 at Jensonusa.com</a>
    Yo Eddy,

    I've bought both of those items exactly and building a commuter--psuedo-singlespeed for going to work and the trails. The wheels (now $89!) seem bomber (36 hole), but not sure if the hub will be efficient enough for trail work. Not so sure about the coaster brake. Do you know if you can remove it?

    I think I'll get a set of single speed wheels later. You ride singlespeed out in Marin from time-to-time? What are your gears? I think for commuting into SF I'll use the big ring from my Race Face turbine crank (46?) and reset it to the middle for trail work.

    So far the project is gonna total out at around $300.

    New parts. Frame/fork, Wheels, Chain, Tires, cheap BB

    Used parts: WTB greaseguard headset, RaceFace crank, Ritchey post, cage-SPD pedals, Avid brakes and levers.

    I'll post a pic in a few weeks. Great minds think alike. Later

  7. #7
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    Here's what I did

    <img src="https://gallery.consumerreview.com/webcrossing/images/drive885.jpg">

    I used a sram chain with two powerlinks. If you choose the right gears, you can take out exactly two links and the brakes will still line up.

  8. #8
    WWYD?
    Reputation: johnnyb's Avatar
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    That 3-speed hub

    Quote Originally Posted by Fast Eddy
    <img src="https://gallery.consumerreview.com/webcrossing/images/drive885.jpg">

    I used a sram chain with two powerlinks. If you choose the right gears, you can take out exactly two links and the brakes will still line up.

    Yo Eddy,

    Is that for the 3-speed hub? I think I can tension up the chain if I set it up for the big ring first with a little extra play and stretch the chain out when I put it in the middle. Probably stay with the big ring for commuting.

    What I was wondering is the coaster brake; Have you or anyone else taken the arm off and made it into a freewheel? I wonder if it compromises the hub strength taking out the coaster innards.

    johnnyb

  9. #9
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    Have to look to understand

    Your plan with the powerlinks is mo betta to line up the brake pads with. I'll go with that.

  10. #10
    The man who fell to earth
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    3 speed blues

    I thought the 3 speed internally geared hub would be a great idea too. But I researched them pretty good before I took the plunge, and the results were a bit mixed. First, you can't use disc brakes, which is a bummer (for me anyway). Secondly, the efficiency of the internally geared hubs is considerably less than that of a singlespeed (by several percent in fact). If it is in its direct drive mode (1:1 lockup) then the internal geared hub's efficiency increases to the point where it rivals a derailleur/cassette setup, but it's still a few points under the singlespeed's almost perfect efficiency (usually 97-99%). The internal geared 5-7 speed hubs have really quite awful efficiency in the high and low gears (going into the high 80's and low 90's even). But efficiency increases (and peaks) as you approach 1:1 final drive ratio.

    Also, from what I heard the durability of the Nexxus hubs is pretty suspect for offroad use. If you're going to go this way I would recommend the SRAM hub, which is the same one that Sachs manufactured for many years (SRAM bought them out). Supposedly the SRAM/Sachs hub is more durable and will hold up better to mountain bike style pounding. But most of them have rather vulnerable looking shifters protruding from the axle which looks to me like shear-off material too.

    Not trying to down on the 3 speed hub concept, but thought you should know. (then again, only $99 for the complet wheelset? Maybe just go for it and give it a shot)

    good luck...


    Quote Originally Posted by Fast Eddy
    <a href="https://www.nashbar.com/profile.cfm?category=&subcategory=&sku=11246&brand ="><img src="https://www.nashbar.com/nashbar_photos/medium/YW-SNX.gif">
    Shimano Nexus 3-speed Wheelset with coaster brake and shifter, 110mm spacing, $99 at Nashbar</a>

    plus

    <a href="https://www.jensonusa.com/store/product.aspx?i=FR707A01"><img src="https://www.jensonusa.com//store/imgWrapper.aspx?img=/fr/fr707a01.jpg&type=3">
    Redline Monocog and fork, 110mm spacing, $115 at Jensonusa.com</a>

  11. #11
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    Quote Originally Posted by Ziggy-Stardust
    ... First, you can't use disc brakes, ...
    SRAM duo drive hub is a 3-speed hub that is shimano cassette friendly and has a disc brake option. Originally part of the Sachs 3x7/3x8 system that was sold as an MTB group, now sold by SRAM as a rec. group. It's pretty efficient and has survived off road well (unlike the Nexus which lasted 3 months):
    <img src="https://gallery.consumerreview.com/webcrossing/images/dekerf_DD_shifter.jpg">

    I have a crash bar around the shifter now, and it's still working after seeing rocks up close.

    Cheers,

    Tom

  12. #12
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    Yes I've heard of the SRAM 3x8 hub, which I considered buying as well. But I was referring to the cheaper, basic SRAM/Nexxus hubs similar to what Fast Eddy was posting.

    I'd love to use a hub like that, because there are times when a singlespeed hurts on certain "walker" hills and on some extended flats. A simple, elegant, low and high in addition to 1:1, in a mud sealed case is just what the doctor ordered. I don't need nor do I want 28 friggin gears, but three would be nice if I could get it done without a clunky derailleur/cassette deal.

    But again, unless there is some unique changed feature in this newer disc hub's internal gearing system, there is a fairly significant reduction in efficiency when compared to a singlespeed setup. Is there some new test data that demonstrates this hub has increased efficiency over previous hubs? Plus most of the internal geared hubs add a pound, or two (or three even) when compared to an SS hub. And I'm not sold on durability either, at least not yet.

    Red-haze posted his results about the sram 3 speed disc hub awhile back:

    https://forums.mtbr.com/showthread.p...am+3+speed+hub

    I dont know if he's a rock 'n roll freerider and/or a giant clyde, but the durability appears to be an issue even with the SRAM stuff. I wish you luck with your hub, how long have you been riding it and what kind of use do you subjected it to?



    Quote Originally Posted by itsdoable
    SRAM duo drive hub is a 3-speed hub that is shimano cassette friendly and has a disc brake option. Originally part of the Sachs 3x7/3x8 system that was sold as an MTB group, now sold by SRAM as a rec. group. It's pretty efficient and has survived off road well (unlike the Nexus which lasted 3 months):
    <img src="https://gallery.consumerreview.com/webcrossing/images/dekerf_DD_shifter.jpg">

    I have a crash bar around the shifter now, and it's still working after seeing rocks up close.

    Cheers,

    Tom

  13. #13
    try driving your car less
    Reputation: jh_on_the_cape's Avatar
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    Quote Originally Posted by Ziggy-Stardust
    I'd love to use a hub like that, because there are times when a singlespeed hurts on certain "walker" hills and on some extended flats. A simple, elegant, low and high in addition to 1:1, in a mud sealed case is just what the doctor ordered. I don't need nor do I want 28 friggin gears, but three would be nice if I could get it done without a clunky derailleur/cassette deal.
    me too. mostly for the few miles of flat road to the trails.
    Only boring people get bored.

  14. #14
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    Quote Originally Posted by itsdoable
    SRAM duo drive hub is a 3-speed hub that is shimano cassette friendly and has a disc brake option. Originally part of the Sachs 3x7/3x8 system that was sold as an MTB group, now sold by SRAM as a rec. group. It's pretty efficient and has survived off road well (unlike the Nexus which lasted 3 months):

    Cheers,

    Tom
    Did you have to buy a special shifter, or would an old thumb shifter work? i know it's not SS, but i would be interested in some more info on that thing.
    thanks
    Only boring people get bored.

  15. #15
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    Quote Originally Posted by Ziggy-Stardust
    Yes I've heard of the SRAM 3x8 hub... there is a fairly significant reduction in efficiency when compared to a singlespeed setup. Is there some new test data that demonstrates this hub has increased efficiency over previous hubs? Plus most of the internal geared hubs add a pound, or two (or three even) when compared to an SS hub. And I'm not sold on durability either, at least not yet.

    Red-haze posted his results about the sram 3 speed disc hub awhile back:
    http://forums.mtbr.com/showthread.ph...am+3+speed+hub
    Cool, I missed Red-haze's post back then. I've had my hub a bit longer, he asked me about it when he bought his. Mine has done it's duty both commuting (mostly trail) and many off-road miles, rock gardens, mud (lots of that) / snow /ice/water, and is still working (unlike my first Nexus). No big drops, just little ones. Have not ridden it as much recently as I've been using my SS and fixie more - actually I just took it off 2 weeks ago to convert that frame to a fixie. Probably won't get much use until next winter. I DO expect it to break like Red-Haze's eventually, most of my bike parts eventually break in fatigue mode.

    Durability: Better than Nexus. It's not well sealed, so all those mud rides have made it a bit gritty. My Nexus broke like Red-Haze's, only earlier.

    Efficiency: on a truing stand, the wheel will spin as long as any other good hub (again, unlike Nexus). In direct drive, there does not seem to be any difference to a good SS setup. In the other gears, it's noticably better than the Nexus, but I've not made any measurements. After a year of mud, it spins less smoothly.


    Quote Originally Posted by jh_on_the_cape
    Did you have to buy a special shifter, or would an old thumb shifter work?
    Shifter came with it, there are 3(?) options. I put a twist shifter on the seat post, made it a set & forget. I was considering putting a shifter right on the axle, so you had to reach down and set it, but the seat post was much more convenient. It was run more like an SS, left it in "high" on the road, direct drive on the trails, and "low" in deep snow, mud, long stream crossing, sometimes long climbs. Friction shifters are probably not a good idea as the hub is not happy when it is inbetween gears, but they do have a thumb shifter option.

    Cheers,

    Tom

  16. #16
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    Quote Originally Posted by itsdoable

    Shifter came with it, there are 3(?) options. I put a twist shifter on the seat post, made it a set & forget. I was considering putting a shifter right on the axle, so you had to reach down and set it, but the seat post was much more convenient. It was run more like an SS, left it in "high" on the road, direct drive on the trails, and "low" in deep snow, mud, long stream crossing, sometimes long climbs. Friction shifters are probably not a good idea as the hub is not happy when it is inbetween gears, but they do have a thumb shifter option.

    Cheers,

    Tom
    thanks. if you get a chance, could you please email me a picture and any other specific info i might need to get this going on my bike. dont want to clutter this forum with 3 speed stuff... [email protected]
    thanks again. you always have such neat stuff!
    Only boring people get bored.

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