44T sprocket diameter too small

Discussion in 'Motorized Bicycle General Discussion' started by gobiewankenobi, Sep 10, 2009.

  1. gobiewankenobi

    gobiewankenobi New Member

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    The sprocket, in the kit that's yet to arrive, has an inner diameter of 3.7cm. The hub that it needs to go onto is more like 5cm.
    How can I go about enlarging this hole? Or is there a replacement sprocket that I can get that will work? The bike is an older cruiser model, 3 speed internal gear hub with coaster brake.

    Thanks.
     
    #1 gobiewankenobi, Sep 10, 2009
    Last edited: Sep 10, 2009
  2. RedB66

    RedB66 New Member

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    It depends on your resources. You can dremmel the hole larger, hand file or stick a found file in your drill chuck. Just be sure to keep the hole even.
     
  3. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I once used a cutting torch & a fat round file, because it was going on a really big hub!!
    It helps to first draw the new hole size with a felt marker, (to keep the hole even & centered)
     
  4. Coval_PL

    Coval_PL New Member

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    I've got the same problem. I want to apply new wheels with Sram S7 gear-hub, but it's a lot bigger than standard hub. Making bigger hole or drill new holes for bolts is not so difficult but what about rubber and steel mounting parts? I have no idea how to do those mounting parts.
     
  5. NEAT TIMES

    NEAT TIMES New Member

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    if you have the money to spare "manic mechanic" has the best set up around. he advertises on the side column of this forum. check out the pictures. you have to order the one to fit your hub.GOBIE, I`M FROM EAU CLAIRE, WI. BEEN DOWN HERE 20 YRS. WHAT TOWN ARE YOU IN. LATER RON .cvlt1
     
    #5 NEAT TIMES, Sep 11, 2009
    Last edited: Sep 11, 2009
  6. city of angels

    city of angels New Member

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    go to usa bike motors.com web site they sell the hub the sproket kit for around 75. bucks plus tax this set up will prevent you from drilling holes ir putting tension on the spokes the only thing you have to go to a bike shop to get it re spokes plus this also will give you a brake set up
     
  7. gobiewankenobi

    gobiewankenobi New Member

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    I'm down in Madison. I'm hoping that this will help me do some commuting but, if nothing else, it'll be fun to play with.
    While Manic Mechanic's setup looks great, I don't have that much money to play with. I'll probably try to find a machinist in town that will mill out the hole to 50mm. I'd do it myself, but I'm having trouble finding a bit large enough.
     

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