Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9
  1. #1
    Senior Member
    Join Date
    Sep 2007
    Posts
    77
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Alfine 8 speed and two ring crank

    Hello,
    Has anyone checked out the Schwinn site and seen their World Adventure model? Anyway it has that new Alfine group. 8 speed internal hub, two chainring crank. Never seen that before. I figure this must be shimanos answer to the Rohloff. Not as pricey, but still have to deal with a derailer. I'm not sure if still running a front derailer is a good idea. I liked SRAM's concept of the 3X8 duodrive, but I guess that tends to break.Anyhow, as soon as someone gets this ride, let us know whatyou think. I'd offer a link, but don't knkow how to do that.

  2. #2
    nashcommguy
    Join Date
    Feb 2006
    Location
    nashville, tn
    My Bikes
    Commuters: Fuji Delray road, Fuji Discovery mtb...Touring: Softride Traveler...Road: C-dale SR300
    Posts
    2,500
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    A friend of mine and I were talking about this very thing the other day. Single speed hub w/a tensioner and a front der w/2 chainrings, maybe a 50t and 40tx16. Also, in the same conversation we talked about a 3 sp bottom bracket/crank assembly w/a 7 or 8 speed internally geared hub. Seems we're a little late.

  3. #3
    Trans-Urban Velocommando ax0n's Avatar
    Join Date
    Nov 2006
    Location
    Lenexa, KS
    My Bikes
    06 Trek 1200 - 98 DB Outlook - 99 DB Sorrento
    Posts
    2,400
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sheldon beat you to it (in a way, with an old Sturmey Archer 3 speed instead of an Alfine 8) and then some.

    http://sheldonbrown.org/otb.html
    ax0n: Geeky and bikey
    My latest tip: Carrying your laptop
    My latest geeky project: Ethernet-testing cuff links

  4. #4
    nashcommguy
    Join Date
    Feb 2006
    Location
    nashville, tn
    My Bikes
    Commuters: Fuji Delray road, Fuji Discovery mtb...Touring: Softride Traveler...Road: C-dale SR300
    Posts
    2,500
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ax0n View Post
    Sheldon beat you to it (in a way, with an old Sturmey Archer 3 speed instead of an Alfine 8) and then some.

    http://sheldonbrown.org/otb.html
    What I should've said was a three speed 'internally geared' bb w/a single chainwheel coupled with a 7 or 8 speed hub w/a single cog. Thanks for having me clarify. Read the link to the SB article and though it's very innovative and funny he doesn't mention a bb w/ig. Everything is based on a triple chainring, 7 sp fw and a 3 sp SA hub. There must be something limiting about the type of torque/motion one applies at the cranks for what my friend and I came up with not to have been developed. Apologies to the OP for the thread drift.

  5. #5
    Senior Member climbhoser's Avatar
    Join Date
    Jul 2007
    Location
    Parker, CO
    My Bikes
    SS Surly Crosscheck; '91 Cannondale 3.0
    Posts
    1,657
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by nashcommguy View Post
    What I should've said was a three speed 'internally geared' bb w/a single chainwheel coupled with a 7 or 8 speed hub w/a single cog. Thanks for having me clarify. Read the link to the SB article and though it's very innovative and funny he doesn't mention a bb w/ig. Everything is based on a triple chainring, 7 sp fw and a 3 sp SA hub. There must be something limiting about the type of torque/motion one applies at the cranks for what my friend and I came up with not to have been developed. Apologies to the OP for the thread drift.

    I've thought about the 3spd. BB and IGH option for some time. Not enough to really dig, but I agree that there must be some incompatability for us to not have seen it yet. Though I actually got the idea from someone else's thread drift many moons ago.

  6. #6
    Senior Member
    Join Date
    Aug 2005
    Location
    Washington DC area
    Posts
    243
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Check out the new Jamis 08' Commuter. I have last year's 3.0 model with the Alfine group and love it. I think the new model is the 4.0?

    It has 2 rings with a derailer and chain tensioner plus they added disk brakes. Sheldons shop gave the original bike last year great remarks and they stocked it as well. At $539 (for the 3.0) you'll have plenty leftover to add quality accessories and still remain under $1,000 for a nice, simple all weather ride.

  7. #7
    Senior Member grolby's Avatar
    Join Date
    Jan 2005
    Location
    BOSTON BABY
    Posts
    6,791
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by nashcommguy View Post
    There must be something limiting about the type of torque/motion one applies at the cranks for what my friend and I came up with not to have been developed. Apologies to the OP for the thread drift.
    A more likely reason that such a system hasn't been developed on a production bicycle is, as Sheldon Brown says, "nothing exceeds like excess." The technology exists (SRAM DualDrive 3x9, quad front rings, Schlumpf dual drive bottom bracket) to create a bicycle with 216 gears. But such a thing is outside the bounds of usefulness, as is Sheldon's tame-by-comparison 63-speed OTB. I think that we reached the level of covering the ground we needed with triple cranks and 7-speed cassettes and freewheels. More than that is certainly nice, but I think that, beyond 21 speeds, everything else is just gravy.

  8. #8
    tcs
    tcs is offline
    Palmer tcs's Avatar
    Join Date
    Mar 2007
    Location
    Parts unknown
    Posts
    4,142
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The Shimano Nexus/Alfine 8 has goofy ratio steps between the gears. To half step this hub, one would have to use three chainwheels.

    Starting with - arbitarily - a 700x32 and 23T cog. The three chainwheels could then be a 42T, 45T and 47T.

    Gear progression would be:
    1st ratio, 42/23 = 26"
    1st ratio, 47/23 = 29"
    2nd ratio, 42/23 = 32"
    2nd ratio, 45/23 = 34"
    3rd ratio, 42/23 = 37"
    3rd ratio, 45/23 = 39.5"
    4th ratio, 42/23 = 42"
    4th ratio, 45/23 = 45"
    5th ratio, 42/23 = 49"
    5th ratio, 47/23 = 55"
    6th ratio, 42/23 = 60"
    6th ratio, 45/23 = 64.5"
    7th ratio, 42/23 = 70"
    7th ratio, 45/23 = 75"
    8th ratio, 42/23 = 79"
    8th ratio, 45/23 = 85"

    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.

    "Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008

  9. #9
    Selfish bitter clinger.
    Join Date
    Aug 2006
    Location
    Red Stick
    My Bikes
    Surly 1x1 commuter, Specialized Epic, Litespeed Ultimate, Nishiki Sport, Trek zx6000, Fisher Sugar team issue, Surly Big Dummy, 1984 Trek 400, Trek 820, kabuki road bike.
    Posts
    187
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I upgraded to a red band nexus 8 from derailure gears with a close ratio cassette. It was a bit difficult getting used to some of the big jumps of the nexus, but I've adjusted. I live in a flat area, so finding one chain ring up front that gives me a comfortable cruse in 6th gear, or whatever gear you are happy with. I have plenty of speed range for the riding that I do.

    I wrote all that to say that I don't need two chain rings, I just deal with the hub like it is. I do wish I had closer spacing though.
    I like bikes.
    My Blog

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •