freewheel crank

Discussion in 'DIY Home Built Motorized Bicycle (non kit)' started by comfortableshoes, Nov 12, 2008.

  1. comfortableshoes

    comfortableshoes New Member

    Joined:
    Jul 22, 2008
    Messages:
    606
    Likes Received:
    0
    So I got to thinking about building my winter build and looking at a jackshaft kit. I tell you if money weren't so tight I'd just buy one of Pablo's kits. But I was thinking how can I get that front crank to freewheel?

    I was looking through c list and I saw a tandem. DUH! The rear crank for the stoker is a freewheel crank with 2 sprockets. When the guy in front pedals the guy in the rear doesn't have to but the freewheel on a tandem rotates and transfers the power to thew rear- freewheeling.

    So the real question is where do I find a cheap stoker set of cranks? I looked at all the bike part sites and the cheapest I found them is $105. For that price I could save up the $$$ to buy the Pablo set.

    Anyone know where to get these cheap, used or something?

    And better yet has anyone tried this so that they can keep the pedals but use a jackshaft?
     
  2. Egor

    Egor New Member

    Joined:
    Jan 30, 2008
    Messages:
    714
    Likes Received:
    0
    I am looking to build a Mountain Bike that I can use off road, on official bike trails. It needs to be lite and still look like a Mountain Bike. I was thinking that it would be best if I were to use a freewheel main crank. I would like to have the engine over the rear wheel and fetch the chain down to the main crank. with a freewheel on the engine I would be able to operate the bike with or without the engine running. As a mater of fact I would like to start and stop the engine while still in motion. It would then be able to use the gears to propel the bike in any condition of road. Have fun, Dave
     
  3. comfortableshoes

    comfortableshoes New Member

    Joined:
    Jul 22, 2008
    Messages:
    606
    Likes Received:
    0
    I think a clutch would solve the issue on the engine. But I agree withyou if you are running the engine chain to the main crank you need a freewheel up there.

    The real question is where do you get one cheap? New or used? Ebay and craigslist are a dead end.

    I put an ad on craigslist to see what I get but I haven't had much luck searching for parts like that before so we'll see what I get. I might call and chat with my local guys.
     
  4. deacon

    deacon minor bike philosopher

    Joined:
    Jan 15, 2008
    Messages:
    8,119
    Likes Received:
    0
    Ah the joy of friction drive lol... Just put the engine in a saddle bag and drop it when you need it lol....

    All that other stuff is way too complicated for an ole city boy..
     
  5. jasonh

    jasonh New Member

    Joined:
    Jun 23, 2008
    Messages:
    1,590
    Likes Received:
    0
    Honestly I think that's where some of the expense of Pablo's kit comes in. Those things just aren't common enough to be cheap. You could look into a bicycle/parts recycler maybe...
     
  6. Ghost0

    Ghost0 New Member

    Joined:
    Mar 7, 2008
    Messages:
    764
    Likes Received:
    0
    I think the more you search and investigate the more you will soon realize that the price we charge for our kits is extremely reasonable. You just can't put all those pieces together for the price we are selling it for, especially if you factor in any labor and fabrication time. Just an example, so you need a sprocket, it has to fit a bike chain or the 415 chain. Guess what they don't make one. So you will have to find a similar one, and you maybe are able to get it for $10-$15. Then you will have to send it to a machine shop to have it machined, there goes another $30 for them to machine it. So now your $10 sprocket is $40. If you continue on that path for most of the parts necessary you will be well over $200 very quickly. Not trying to discourage or practice salesmanship just stating the facts. We have actually provided technical assistance to many that wanted to do their own and they almost all ended up buying a kit because in the end it was cheaper.
     
  7. comfortableshoes

    comfortableshoes New Member

    Joined:
    Jul 22, 2008
    Messages:
    606
    Likes Received:
    0
    ghost as I've been doing the research the one thing that sets me back is the price of the crank. the rest of it not so much.

    has anyone used your kit with a Weed whacker?
     
  8. Ghost0

    Ghost0 New Member

    Joined:
    Mar 7, 2008
    Messages:
    764
    Likes Received:
    0
    The kit as it is designed works only with the China 2 strokes, the way it all mounts together will not work for any other engine. We are working on a kit for the frame mount 4 stroke Honda and Huasheng but that will be a little while.
     
  9. Egor

    Egor New Member

    Joined:
    Jan 30, 2008
    Messages:
    714
    Likes Received:
    0
    I think if I were to start the build I would just use Ghost0's outfit, like he said it would cost more to start buying each piece. I like the friction simplicity but tired of the slipping. For off road with mud and the like it would never keep up. I still might work on my dual roller outfit and see how that would work. Larger rollers and gear them down with sprockets. The larger rollers get better grip. Have fun, Dave
     
  10. deacon

    deacon minor bike philosopher

    Joined:
    Jan 15, 2008
    Messages:
    8,119
    Likes Received:
    0
    I have been house bound today and will be tomorrow rain. i would have to plan to have days like this if I did not have a wife who still drives.
     
  11. jasonh

    jasonh New Member

    Joined:
    Jun 23, 2008
    Messages:
    1,590
    Likes Received:
    0
    For what it's worth, I did find this today...

    Misc. Parts

    They have a freewheel adapter for $32 (out of stock though) and crankset for $42. That puts you at $78. You'd have to figure out the sprocket stuff though...
     
  12. comfortableshoes

    comfortableshoes New Member

    Joined:
    Jul 22, 2008
    Messages:
    606
    Likes Received:
    0
    That's exactly what I'm looking for... I'm gonna have to save my pennies!
     
  13. Large Filipino

    Large Filipino New Member

    Joined:
    Jul 22, 2008
    Messages:
    656
    Likes Received:
    0
    Buy that adapter and buy the sprocket that goes with that adapter and you have a fail because to make it all work you need TWO sprockets to freewheel.
    I guess you can fabricate a mountain bike sprocket up front...
     
  14. comfortableshoes

    comfortableshoes New Member

    Joined:
    Jul 22, 2008
    Messages:
    606
    Likes Received:
    0
    it's a standard 5 hole design. once you get the crank and freewheel all you need are sprockets- theoretically all you'd need to do is move your old MTB sprocket over to the new freewheel. 5 screws. cake.
     
  15. Pablo

    Pablo Master Bike Builder & Forum Sponsor

    Joined:
    Dec 28, 2007
    Messages:
    3,647
    Likes Received:
    0
    Has anyone tried to buy from Cyclone USA lately?

    Last we checked they were NLDB. Only Cyclone in Taiwan. It may have changed recently, but methinks we would have heard....
     
  16. jasonh

    jasonh New Member

    Joined:
    Jun 23, 2008
    Messages:
    1,590
    Likes Received:
    0
    NLDB?

    I haven't found anything similar anywhere else.
     
  17. Pablo

    Pablo Master Bike Builder & Forum Sponsor

    Joined:
    Dec 28, 2007
    Messages:
    3,647
    Likes Received:
    0
    No Longer Doing Business.

    Well that's obviously the freewheel we use in the Shifter Kit.

    Dicta Brand (Lida Co.) has some "infant mortality" issues. Mostly because of the terrible grease they are filled with, but other issues as well. If you go to all the expense of ordering from Taiwan, the freewheel will be filled with the nasty "pig" grease. (I have some greased units in the shop, even at 47°F, they barely turn and the pawls hang). Also there is no sorting process, you get a dud, you got a dud.

    We are out of stock right now, (all are in made up kits), but Sick Bike Parts will not only beat that price for the cranks and the freewheel, we will screen and prelube them. We start with a freewheel that is specifically purchased with just a light machine/preservative oil. We methodically test them and then lube with SBP freewheel oil, plus if it fails under warranty we will replace it.
     
  18. jasonh

    jasonh New Member

    Joined:
    Jun 23, 2008
    Messages:
    1,590
    Likes Received:
    0
    Dude, you guys are awesome.

    Wish I could afford a kit right now. Once you figure up the time and cost of all the individual parts, it's totally worth it.
     
  19. comfortableshoes

    comfortableshoes New Member

    Joined:
    Jul 22, 2008
    Messages:
    606
    Likes Received:
    0
    true enough jasonh...

    Not to mention the TIME in short supply searching out the parts.

    AS soon as I save up my pennies and buy another engine I'll be buying one, might take me some time but I'll get a kit eventually.
     
  20. Egor

    Egor New Member

    Joined:
    Jan 30, 2008
    Messages:
    714
    Likes Received:
    0
    Pablo - Do you think your kit would would work with a 5 speed internal hub shifter? I would like to install one on the Schwinn. How are the rear derailleurs holding up to the extra power from the engine? have fun, Dave
     

Share This Page