Brakes 6 Bolt disc brake freewheel adapter

Discussion in 'Bicycle Repair' started by dnilosek, Aug 19, 2011.

  1. dnilosek

    dnilosek New Member
    I think this guy has a great idea for making it easy to get a freewheel on the drive side of a bike wheel equipped with iso disc brake mounting bolt holes. Left hand threads would be all it needed, or a couple of spot welds after being attached to a freewheel sprocket.

  2. loquin

    loquin Active Member

    Pretty nice - it looks like what I posted a sketch (post #4) for a couple of years ago - sort of nice to see the 'as built' image...
    Last edited: Aug 25, 2011
  3. happycheapskate

    happycheapskate Active Member

    Why put a left handed freewheel on the right side of a bike?

    If you want to use the disc brake holes to hold a drive cog, you could do that, but it would be cheaper and easier to use a multi-speed freewheel hub, with a common cog, 1 rubber donut and bolts, and a BMX freewheel.
  4. loquin

    loquin Active Member

    I read his post as referring to the motor drive side (left side, opposite the 'standard' drive side on the right.) Otherwise, it wouldn't make any sense...
  5. happycheapskate

    happycheapskate Active Member

    The website described using it to mount a disc rotor on the right side, behind the freewheel, for custom frames.
  6. loquin

    loquin Active Member

    A threaded adapter on the right, if used to mount a thread-on disk brake rotor, would need left hand threads. On the left side, a thread-on adapter for a disk rotor would need right-hand threads. This is opposite the thread direction requirements for thread-on freewheels... (As the brake caliper/pads apply torque in the opposite direction as the chain/sprocket.)

    I've also seen a disk-brake thread-on adapter used to add standard 44mm 6-hole disk brake mount to a flip-flop hub (per image, below.) On the left side, when the brakes are applied (and you are slowing down) the torque tends to tighten a RH threaded adapter.

    However, if the user flopped the hub, so that the disk brake mount is on the right, and added the adapter above, to use a freewheel on the right as well, you would need standard, RH threads their.

    Of course, this means that you could then also use the adapter below, and have disk brakes on on BOTH sides (assuming that the hub was a thread-on version, rather than a cassette.) Why you would want this, I don't know, as a single disk is certainly capable of locking the rear wheel...

    Attached Files:

    Last edited: Aug 30, 2011
  7. happycheapskate

    happycheapskate Active Member

    Nah, the adapter is right hand threaded, for the freewheel. the adapter mounts to the 6 bolt circle for the disc rotor, and the rotor mounts on top of that, using the same screws. The adapter is oblivious to direction as long as the caliper is mounted straight (on right hand side would be a custom job). The freewheel needs RH threads bc. its on the RH side of bike (hub is reversed)