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Thread: The Triple Double Sprocket Thread, Too Much?

  1. #31
    Senior Member Gerry's Avatar
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    Appreciate the 'Sprocketiers' willingness to carry the torch in my absence. The front sprocket chain reposition had been pretty straight forward. The "V" in the side case afforded me a better view. With the rear wheel off the ground and free to rotate (Crutch Jack) and the chain slack, a slight push/pull with your fingers to 'MISS ALIGN' while rotating the wheel/chain forward will reposition the chain. Now realize, though simple, practice is a plus. It should be thought of as 'simple and quick'. Many thanks to Brian and Fred.
    Take care my Friend.........

  2. #32
    Senior Member jb882's Avatar
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    Quote Originally Posted by JerseyJeeper View Post
    And here's a weld on model for those not quite as talented..
    Attachment 30244
    im at a loss for words here.
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  3. #33
    Senior Member phelonius's Avatar
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    I believe that the double front sprocket will increase the strain on the tranny shaft by putting more leverage on it.
    This may shorten the bearing life on that shaft.
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    Phelonius

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  5. #34
    Senior Member Trail Woman's Avatar
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    If you can add a derailer and prove it will hold up you'd get a lot of buyers I'm sure. Very impressive.

  6. #35
    Senior Member ben2go's Avatar
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    Quote Originally Posted by phelonius View Post
    I believe that the double front sprocket will increase the strain on the tranny shaft by putting more leverage on it.
    This may shorten the bearing life on that shaft.
    Normally, I would agree with you. However, the TW200 output shaft is supported outboard by a bearing that is lubricated by pressurized oil from the engine. The chain only runs on one sprocket at a time with the same chain tension. There would be no more wear than an unmodified TW output shaft.

  7. #36
    Senior Member tylermoney's Avatar
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    @TW-Brian

    So, this may be a stupid question, but how do you change from sprocket to sprocket? Do you just have to remove/reinstall the chain when you want to switch with sprockets you're using, or do you have a way to switch them on the fly like on a standard multi-gear bicycle?

    Quote Originally Posted by TW-Brian View Post
    A few weeks ago, my friend Gerry (aka Mr. Gizmow) sent me this little jewel of a dual front sprocket assembly (13/15) with all the fixings.

    Attachment 30051



    Attachment 30049


    I have been running a dual rear sprocket setup for about the last 3,000 miles with various size combinations including 47/50, 47/55 and most recently 55/65. A dual rear sprocket setup just barely fits between the sprocket mounting flange and the swingarm. Gerry's bombproof sprocket assembly has the sister sprocket (13 teeth) mounted inboard from the stock mounting position. Here it is mounted with the chain on the inner sprocket.

    Attachment 30050

    This got me wondering if a third rear sprocket could be mounted on the inboard side of the sprocket mounting flange. In order to do this, a split sprocket would be required. I remembered that one of Gerry's project had involved a sprocket that he had split in half and I believe he bolted back together. A call to Sprocket Specialists determined that they would be happy to split a 66 tooth rear sprocket for me and they asked me if I wanted a link lock. They explained that with a link lock, they drill holes on either side of the kerf and use a couple of master links to help keep the sprocket halves from flexing. So I said sure, give me the link locks.

    Here are the rear 47/55/66 sprockets mounted .

    Attachment 30052

    It is tight, but there is clearance, even with my ATV rear tire. And the alignment is actually pretty good except for that rubber chain guard thingy that goes around the front of the swingarm. If this proves to be a problem, I may try to mount this guard further inboard, or possibly add a second one inboard of the stock one.

    Attachment 30053

    Do I really need a TW with 30 different speeds (or 36 if I used this setup on my TW226 6-speed)?

    Of course not, but I just wanted to see if it was possible to do .

    (Gerry, thanks again for giving me the opportunity to test out this prototype - it looks like a winner to me!)
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  8. #37
    Super Moderator littletommy's Avatar
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    Didn't you see the derailleur on there?
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  9. #38
    Senior Member TW-Brian's Avatar
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    Quote Originally Posted by tylermoney View Post
    @TW-Brian

    So, this may be a stupid question, but how do you change from sprocket to sprocket? Do you just have to remove/reinstall the chain when you want to switch with sprockets you're using, or do you have a way to switch them on the fly like on a standard multi-gear bicycle?
    Hi Tyler,

    Changing sprockets is currently all done manually, sometimes requiring the addition or removal of a small section of chain.

    It would definitely be nice to be able to change on the fly and I even played around a little trying to use a chain tensioner as a derailleur, but gave up on it as it required too much linkage travel to accomodate the extra chain links needed.

    Brian


  10. #39
    Senior Member Fred's Avatar
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    I purchased the dual front and dual rear sprocket equipped MrGizmo from Jerry and have never used all 4 of the possible drive ratio combinations. I think about it though when contemplating a longer highway adventure but always end up trail riding where the granny gearing is optimal. So the 15X47 remains available for another jaunt over Tioga and through Yosemite.
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