Can you use a rear disc brake....

Discussion in 'Rack Mounted Engines' started by Warner, Oct 21, 2009.

  1. Warner

    Warner Member

    Does anyone have a rear disc brake setup with a Staton chain drive setup? According to Staton, you can't do this without the nuvinci hub setup. Is that the case? I'd like to convert to a rear disc....just wondering if it's possible with my chain drive Staton setup....

    Thanks in advance,


  2. DougC

    DougC Guest

    The disk brake is normally on the left side, which is also where the normal Staton chain drive is. The NuVinvci kit has the engine-drive chain on the right side, leaving the left clear for a disk brake.

    If you had the tools, you might build the bike to use the chain-drive sprocket as a disk brake also. I've seen a few custom motorcycles done like that, and at least one motor-bicycle too.
  3. Warner

    Warner Member

    Yep...that is the trouble. Hehe. I've seen some of those conversions that you speak of....I just couldn't justify wearing my sprocket down every time I hit the just seems like a very flawed design to me. But thanks for the response!

  4. loquin

    loquin Active Member

    If the chain breaks, you have no rear brakes...

    The other option would take machining an adapter - similar to andyinchville's "Top Hat" adapter.

    The adapter would consist of a flange, with 6 holes to match the hole pattern of a disk brake. The body of the adapter would be a tube, about 1/2 to 3/4 inch long, threaded 1-3/8 24TPI, with left hand threads. Bolt the adapter to the hub, on top of the disc. Then, the left hand freewheel would thread onto the adapter.

    Note: Edit 1 - Threw together a sketch of the adapter at home this morning.
    Note: Edit 2 - Just added a sketch I did last year (the PDF file,) with some measurements.

    NOTE: the old PDF file had a typo - the threads were labeled 1-3/8" - 20; it SHOULD have said 1-3/8 - 24 ! The sketch is correctly labeled, as is the updated PDF...

    Attached Files:

    Last edited: Aug 24, 2011
  5. Warner

    Warner Member

    How so? In the system described above, the disc caliper is squeezing the would the chain breaking affect that? Am I missing something? I don't like the design either way, but I don't understand how the chain breaking would affect the rear brakes...

  6. loquin

    loquin Active Member

    The OP was talking about a Staton freewheel design. Since there's no room on Staton's design (using an 18 to 22 tooth freewheel sprocket) to have the caliper squeeze the sprocket, I jumped to the conclusion that he would need an additional, idler sprocket on the chain, and grip THAT with the caliper.

    But, with a freewheel, that wouldn't work anyway, unless he put the freewheel at the drive end...
  7. Warner

    Warner Member

    Hehehe...I WAS the original poster. I see what you are saying. If I decide to convert to disc looks like it will be on the front wheel only. Thanks to all who replied.

  8. loquin

    loquin Active Member

    :eek: LOL - so you were! :whistling:

    Without machining an adapter, I think you're out of luck, Warner... :-/

    IF you move the freewheel to the gearbox, and add a somewhat larger sprocket bored/drilled to mount on the disk brake mount, you could use the sprocket as the brake rotor. This would mean that the chain would move while coasting, though. (This is slightly less efficient when coasting, as a chain is, at best, about 98% efficient at power transfer) If you use a steel sprocket, it wouldn't wear much at all... However, this also means that you could use a good quality freewheel, rather than the ACS left hand freewheels that are, according to reports, hit or miss...
    Last edited: Oct 22, 2009