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Losing your Ragjoint!

Discussion in 'Hubs, Gearboxes, Sprockets and Chains' started by Nashville Kat, Jul 12, 2016.

  1. Nashville Kat

    Nashville Kat Well-Known Member

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    On my couple of builds- completed several years ago- I mounted my motor sprocks directly to drilled flip/flop rear hubs (smooth sided large flange)

    Now we can easily and more cheaply get disk brake hubs like these:
    http://www.ebay.com/itm/Pair-Mounta...7d6db36&pid=100005&rk=2&rkt=6&sd=141707441658

    And the ebay guy in Miami at least has alloy sprocks with inner disk brake drillings,
    http://www.ebay.com/itm/MOTORIZED-B...430839?hash=item3f5bffce77:g:ZSMAAOSwpzdWtlhg
    plus you can still get them- a little more money, but super nice- from Kings Sprockets
    http://www.kingssalesandservice.com/

    just noticed another item - f you want to go cheap:
    http://www.ebay.com/itm/30200418287...49&var=600803066188&ssPageName=STRK:MEBIDX:IT
    It's a disk brake adapter that threads on a rear threading-

    luckily I already have one of these lying around:

    http://www.ebay.com/itm/Bike-Bicycl...9a67688&pid=100005&rk=3&rkt=6&sd=222063529655

    So for a 99 cent adapter I'll see if it threads up- I think you can reverse the adapter either way? Wondering if the mounting hole threads are right then?

    Anyway- losing the rag joint and it's long and heavy bolts, and replacing a heavy steel sprocket with alloy- may wear a bit faster- and then using titanium disk brake bolts to bolt it on is a SUBSTANTIAL weight saving
    If you can also drop the heavy steel tensioner it's another chunk of weight off the kit, and a 415 Industrial trike chain is barely half the weight of a kit chain-(rolls better too)

    So- new stuff just keeps coming- a little slow though!

    Still hoping for a lighter 33cc Chna girl for a classic steel road or touring bike. I think the warm days have come for a 15 lbs TOTAL weight kit that will roll along at 22-25 with light and fast wheels.

    .crt.
     
    #1 Nashville Kat, Jul 12, 2016
    Last edited: Jul 12, 2016
  2. Nashville Kat

    Nashville Kat Well-Known Member

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    OK- I just looked at the double threaded hub I have- and both sides are right hand thread-

    so I'm SCREWED probably trying to use the $1.00 adapter, because it appears that the motor chain will just loosen the assembly, unless there's enough threads to put a lock ring on the outside (a bottom bracket lock ring is the same size and thread- did you know?

    Anyway- the adapters may work well with a Flip Flop hub, and you then aren't limited to large flange and smooth sides to drill and maybe you have one or can find cheap- but the rear disk brake freewheel hub is probably the way I'd go these days.
     
  3. crassius

    crassius Well-Known Member

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    the screw on adapter may not work as the chain applies force in both directions (start & run)
     
  4. Nashville Kat

    Nashville Kat Well-Known Member

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    Took delvery on one of the disk brake adapters- a whopping 99 cents delivered so I thought I'd see about it
    http://www.ebay.com/itm/30200418287...49&var=600803066188&ssPageName=STRK:MEBIDX:IT

    I see one application for this- and it is a pretty good one=

    The adapter is too wide once screwed on, leaving no more threads showing- I have one of those steel hubs with right hand threads on both sides- good for freewheel with cenntripical clutch-

    HOWEVER- the adapter leaves no room showing for any additional lockdown- which would probably be little stop-gap and still unwind the right hand threads on the motor side-


    anyway - thought I'd pass that along :-||
     
    #4 Nashville Kat, Jul 28, 2016
    Last edited: Jul 28, 2016
  5. maniac57

    maniac57 Old, Fat, and still faster than you

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    Can you drill and lock it with a bolt or two?
    All you need to do is stop it from turning, so maybe sink a bolt through adapter & flange?
     

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