any sheave that can accommodate two belts?

Discussion in 'Transmission / Drivetrain' started by butterbean, Feb 4, 2014.

  1. butterbean

    butterbean Well-Known Member

    I'm planning a two speed drive with a stepped pulley, two belts and an idler clutch. Anyone know of a rear wheel sheave that can accommodate two BX type v-belts? GEBE? Whizzer? Whizzer clone? I know the gebe sheave is for toothed belts, but if the teeth can be ground off and I can throw two v belts on it, that would work. Or do I need two separate sheaves?
     

  2. butterbean

    butterbean Well-Known Member

    Bump, anyone?
     
  3. butterbean

    butterbean Well-Known Member

    Bump again
     
  4. keatonx

    keatonx Member

    Two belts? Are you going to have a belt for each pulley and have 2 independent belt tensioners?
     
  5. butterbean

    butterbean Well-Known Member

    Sort of. Two pulleys on a pivot arm, moving the pivot arm up or down via a handlebar lever and cable will engage one belt and allow the other to slip. After looking around and researching, aside from a cvt that I'm not sure would work due to having a metric crankshaft, this is the cheapest and the simplest. A cvt might be cheaper, but I can order parts for a two belt setup one at a time. Besides that, I can control this setup manually and shift gears on the fly (no need to go into neutral).
     
  6. butterbean

    butterbean Well-Known Member

    So does anyone have an answer for me?
     
  7. keatonx

    keatonx Member

    Oh, that would work nice; make sure whatever belt that's disengaged has tons of slack, or else the gear ratios will be fighting each other and you'll lose a bit of power. More so with the ax or bx series belts, cuz they aren't wrapped; just bare rubber.

    And I saw your $250-300 estimate in the chat box; what are you making it out of, gold?:jester: two drive sheaves (less than $10 each), two idlers which can be homemade or from a car's belt system, a rear sheave (which can be made with a slightly smaller bicycle rim), two belts and you're basically done
     
  8. keatonx

    keatonx Member

    You should be able to use any rear sheave; there's so much contact area on that massive sheave that it should get tons of grip. I saw a thread where someone converted a FD to v belt drive, using a non v-belt sheave
     
  9. keatonx

    keatonx Member

    Why are you going with the bx series over ax? You'll already have limited width on the rear sheave, and the ax belts are much stroger than you'll ever need. I have an ax-22 on my 140cc lawnmower bike and I abuse it with clutch starts etc. and it hasn't flinched.
     
  10. butterbean

    butterbean Well-Known Member

    Well I was going to buy a Whizzer sheave because it comes with the clamps and the holes drilled exactly where they are supposed to be, no way I am trying to guess where to drill the holes myself. The stepped pulley I found is $50 but if you know where I can find them cheaper....do you think a Whizzer sheave can accommodate two ax belts? and I was also counting the cost of a 1955 roadmaster frame, that's $100.
     
  11. keatonx

    keatonx Member

    The a or ax belts are 1/2" width IIRC, so as long as the rear sheave's 1,1/2" or more in width so the belts don't rub you'll be fine. The whizzer sheave should be wide enough; the look like a regular bike rim to me.

    And for stepped pulleys http://m.ebay.com/itm/281247382393?nav=SEARCH&sbk=1 is the first one I clicked on on ebay, there's billions. And 5/8" converts to a hair under 16mm, it should fit no problem (if it doesn't you can bore it etc.)
     
  12. butterbean

    butterbean Well-Known Member

    The Whizzer sheave I had bookmarked has been sold. The only other one I could find is in Taiwan, and the shipping alone is $30.
     
  13. butterbean

    butterbean Well-Known Member

    I may have a rim that I can use, but the problem is knowing where to drill the holes and then finding the correct size clamps and making sure it's perfectly centered when I mount it.
     
  14. butterbean

    butterbean Well-Known Member

    Well, I have two rims, a 20" and a 24", both only 1" wide, so no-go there.
     
  15. butterbean

    butterbean Well-Known Member

    Might need to buy a gebe sheave and file the teeth down. It's $50 with free shipping, so it's cheaper than the Whizzer clone sheave at $69 shipped.
     
  16. james65

    james65 Member

    sheeve

    I have a sheeve that I purchased on e-bay that has the mounting ring cut off. If you purchase a e-bay sheve and ship it to me, i'll weld them together. You will only have to pay the return shipping. Although I don't think that is the way to go, I'll help you out just to see how it works out.

    Jim E.
     

    Attached Files:

  17. butterbean

    butterbean Well-Known Member

    The gebe sheave is plastic, so that probably won't work. It is for a toothed belt, but I may be able to use it with a v-belt and it might be wide enough for two belts. I'm looking into that.
     
  18. grinningremlin

    grinningremlin Active Member

    A GEBE sheave will only allow for one 9mm wide belt.I think you could use any 9mm belt as long as it wasn't too thick, I don't think there's a need to grind off the teeth/grooves of the sheave, as it usually starts grinding on it's own a bit.If you need close up pics of the GEBE sheave lemme know.
     
  19. butterbean

    butterbean Well-Known Member

    Close-ups would help a lot. For $50 shipped, two gebe sheaves sounds like my best bet.
     
  20. butterbean

    butterbean Well-Known Member

    Guess the plan is to bolt two gebe sheaves together, then.
     
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