Troubleshooting sprocket bolts coming loose

Discussion in 'General Questions' started by Engineer, May 23, 2015.

  1. Engineer

    Engineer New Member

    After riding my motorized bike for a bit I quickly realized the sprockets that are given with the kits are dangerous and put way too much torque on the spokes of the rim for my liking. Therefore I ordered a sprocket that attaches to the hub adapter instead, I got it from KMB since they've got the best deal on them.

    Now, my problem is when I ride (just a few blocks) the alan bolts that attach the sprocket to the hub adapter begin to loosen not cool.. I believe that it may just be the vibrations caused by the motor causing them to ease out, and that maybe some Loctite should secure the bolts. What do you guys think/suggest?

    Photo from KMB website:

    Photo of sprocket on my bike (bolts currently loose):

    - Engineer

  2. butre

    butre Well-Known Member

    you got it, loctite is the answer.
  3. desertsteve60

    desertsteve60 New Member

    Blue not Red!!!
  4. The_Aleman

    The_Aleman Active Member

    Definitely blue Loctite!
  5. Engineer

    Engineer New Member

    Aw jeez, too late. Why blue instead of red, because its easier to remove?

    By the way, the red you see on my chain is just grease
  6. The_Aleman

    The_Aleman Active Member

    Red is more intended for permanent installation. Green is the meanest one. Any man worth his wrist salt will be able to break a red Loctite seal,
    but damaging alum threads is possible with the hard stuff. To stop a bolt from vibrating loose, it doesn't take much.

    Blue Loctite does a great job of preventing any bolt from vibrating loose, while still being easy to remove without compromising the threads.

    Don't be afraid to crank em tight on a hub adapter, either. Wrist-tight plus a little arm pull will do it, let it sit for a couple hours IMHO
  7. butre

    butre Well-Known Member

    red is fine, you just have to apply heat to break it loose. I use red on my sprocket adapters.
  8. Engineer

    Engineer New Member

    Thanks for all the great info. And trust me, I showed the hub adapter no mercy, I spent at least an hour last night making sure I got everything as tight as possible when re-installing it with the loctite.. Maybe overkill but you can never be too careful. I'm currently letting it sit for 24 hours as recommended to let it fully cure.

    Thanks butre, I think I will continue to use red for sprocket adapters on all future builds as well.
  9. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    What tool are you using to tighten those allen bolts?

    If you are only using a short allen key you will never get them tight enough.

    Use a 6" or so tube for a cheater bar to get leverage and torque them to 20' lbs.

    The same goes for the allen bolts holding the 2 halves on the hub.
    Also make sure that the gap between the 2 halves is the same on both sides.