Sprocket adapter slipping

Discussion in 'General Questions' started by cranker789, Mar 8, 2016.

  1. cranker789

    cranker789 New Member

    Hey guys, the sprocket adapter on my bike keeps slipping and breaking my spokes. I just replaced 9 spokes on my back wheel. 3 were broken and 6 were bent. I put the adapter back on with lock tight and screwed it in as much as possible with an allen key. I tried to line the hub with some rubber tubing but then the adapter wouldn't fit with it on there. I took the bike out for a ride and it's slightly bent a few spokes again, so it's still slipping on the hub. Any tips on getting the sprocket adapter to stay put? I thought about using some metal on metal glue, but I think that's a last resort option. Any ideas?
     

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  2. butre

    butre Well-Known Member

    what brand adapter?
     
  3. cranker789

    cranker789 New Member

    I got it on bikeberry, it's for the 5,6,7 speed one inch hub
     
  4. butre

    butre Well-Known Member

    the tolerances on those aren't what they need to be. get some shim stock
     
  5. Legwon

    Legwon New Member

    i agree with butre.
    i had that issue on my last hub as well. i used .016 aluminum.
     
  6. Did the shim stock solution work for you? I am having the same problem. I thought about getting some JB Weld Steel Stick epoxy putty and using that to sandwich between the clamshell and the hub but I don't think that would hold....and if it did, it would be a bear to get off again without my workshop tools accessible here in Korea. I just had my rear wheel spokes repaired but I don't want to risk immediately damaging the spokes again until I think I have a decent solution in place to try again. Let me know
     
  7. Nate888

    Nate888 Member

    Old thread, but i think you could solve it by using a super thin layer of jb weld to affix one or more layers of 120-220 grit sandpaper to the adapter's inner surface
     
  8. butre

    butre Well-Known Member

    shim stock would work, that's what it's for
     
  9. Frankenstein

    Frankenstein Well-Known Member

    Korea sounds like a good excape... Must be interesting to hang out there traveling with a motorized bike, how does the society look at bikes like that? Cool with them or not?
     
  10. Jay bird

    Jay bird Guest

    Same problem here. I've tried everything even resorted to fabricating and machining /drilling into the inside of the adapter and into the hub to fit a 1/4" aluminum dowel/key. Took alot of tedious time and work. Still slipping. My last try is to permanently bond the sprocket adapter to the hub with J.B. Weld Steel Stick on the perimeter of the adapter where is meets the hub (like a weld. Permanently) I've used on other things in the past and it's no joke (sustains 900 lbs per Sq inch). Also the sprocket adapter is a great concept but poorly executed. Physics defeats it. Too much torque and leverage at the wheels and pedals.
    P.s. just noticed someone else mentioned jb weld too. I think it the only thing that could work. I'll be doing forst thing on the morning. I'll keep you posted.
     
  11. Frankenstein

    Frankenstein Well-Known Member

    Don't bother with the jb weld, the shear strength is so low it will release almost immediately from the hub. You should get some shim material, even the tube from an old aluminum bike can be chopped out and split along the side and wrapped around the hub in one or 2 pieces then torqued down. The key is to fill the space just enough so when tightened down properly the adapter simply can't slip. You'll need to provide enough torque on the adapter or it will slip regardless, you are talking about an engine capable of chopping your fingers off rather easily with a chain and sprocket, so put some muscle behind those bolts.
     
  12. Jay bird

    Jay bird Guest

    Btw. I forgot to mention. When I ordered my sprocket adapter from Manic Mechanic I also ordered two reducers (1" and .995") to account for the space between the sprocket adapter and the hub. Tried both and tightened until the bolts threads ended with all my strength. To no avail, they still slipped and we're bending spokes. I went through alot of back and forth correspondence with the guys at Manic Mechanic and tried everything. They even sent out a custom reducer after I send the sprocket back and they machined it some more. Still slipping. I machined the adapter key/dowel in to the hub and adapter and still slipping. Now I'll try the jb weld and post back tomorrow.
     
  13. Nate888

    Nate888 Member

    Clean the bejeezus out of the wheel and adapter contact surfaces, & rough the metal up with some 80 grit sandpaper. I've used Locktite (&/or super glue), both as a thread locker & where the adapter contacts the hub. I think they both help somewhat, but you shouldn't need to rely on adhesives to keep the adapter in place.
     
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