Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    Member norbikes's Avatar
    Join Date
    Sep 2007
    Location
    Mt. Vernon, IA
    My Bikes
    lots!!
    Posts
    38
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    converting a single speed to a multi speed

    I have a Carver single speed bike that I want to convert to multi speed. The frame does not have a derailleur hanger, so I'll need to use an internally geared rear hub. I've no experience with such, so I'm wondering if anyone can suggest something.
    Thanx!
    Nor in Iowa

  2. #2
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    19,948
    Mentioned
    31 Post(s)
    Tagged
    1 Thread(s)
    Lot's of choices of internal hubs, with SA or Taiwan introducing a nice selection of hubs including fixed gear 3-speed. Offhand, I don't know of material quality issues with any so it's a wide open field. One consideration is axle width, look for one that matches your frame or has enough axle length to accept spacers, otherwise you'll need to squeeze your rear triangle down a bit (steel only).

    Also, and this is opinion only, simpler hubs seem to work and last better, so try to stick to proven, simple hubs like 3 and 5 speed models, rather than trying to get touring type wide gearing with 11 speeds for example. If you need wide gearing, consider building this bike as a city bike, and buying a touring or mtn bike for those applications.

  3. #3
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,023
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    Sturmey Archer 3 speeds have alternate axles to build up a narrow axle hub .

    Brompton uses a 120 wide Hub in their folders..

    People have used The Sturmey 8 speed in Bromptons,
    taking off and thinning axle spacers , to reduce width

    Los of newer hubs are 135 width. Alfine 11 one of those. [afaik]

    I have a mountain climbing capability with an AW3 + a Schlumpf Mountain Drive,

    a 2 speed planetary Crankset , Made in Switzerland.
    so low range, offers the 3 hub gears another run thru.
    Shift is internal, no change in the chain tension so no chain tensioner needed .

    Herr Schlumpf also makes 2 overdrive cranks to use a small primary chainring set
    the planetary multiplies the external cog ratio [1.65X or 2,5X]
    Last edited by fietsbob; 03-31-11 at 11:08 AM.

  4. #4
    Senior Member ScottNotBombs's Avatar
    Join Date
    Mar 2008
    Location
    Joliet, IL
    Posts
    405
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I don't know anything about carver bikes, but you might be able to add an adapter to add a rear derailleur. Harris Cyclery sells an adapter claw.
    http://sheldonbrown.com/harris/derailers-rear.html
    I'm just a kid who gets in trouble sometimes

  5. #5
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,023
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    Adapter also makes a IG hub + a double chainring crank work. Its a Kludge.
    but note they assume you have a forward opening dropout, not a rear opening one.

    And the frame lacks cable stops for gear cables.

    you can use the greasy finger shifting between 2 chainrings.

  6. #6
    SmallieBiggs
    Guest
    Depending ont he hub you get, it might be cheaper to buy a budget frame and set up with a derailleur.

    As for IGH, I have an 8 speed alfine and it is the bee's knees... and I am a big guy and very hard on parts. It has become my favourite bike over the past year.

    What is the droput spacing on your bike? Carvers are mountain bikes, right? SO I would assume the spacing is 135mm, which fits Alfine and Nexus 8. If it is not 135 then you will need something else.

    If you've got the dough, the Rohloff Speedhub is still the king of internally geared hubs... although setting up on a bike not designed for it is a little more work.

  7. #7
    Senior Member Monster Pete's Avatar
    Join Date
    Apr 2010
    Location
    Warwick, UK
    My Bikes
    2000-something 3 speed commuter, 1990-something Raleigh Scorpion
    Posts
    1,048
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It might be possible to fit a derailleur if the dropouts are horizontal and not track ends. You can get derailleurs with a built-in adaptor claw, or just buy a claw to fit. However, the crankset/chainring will most likely be for 1/8" chain, so using an IGH will mean less new parts are needed.

  8. #8
    Senior Member
    Join Date
    Oct 2007
    Location
    West Yorkshire, United Kingdom
    Posts
    3,135
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Take it that this is a Original 96er. If so, you should have and EBB as well as two drive-side dropouts (one with a derailleur hanger and one without).

    You should be able to go to you local Carver dealer and order the correct drive side dropout if you don't have the deraileur hanger one http://www.carverbikes.com/Dealers/#Auth

    Forget the Brompton hub or Sturmy Archer, these are not appliciable for what is a pretty custom MTB, although Alfine 11 may work; but if you have the correct parts, a normal deraileur gear system should be easy to install.

    If not, photos please to see what you have

Posting Permissions

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