engine side transmission w gears

Discussion in 'Frame Mounted Engines' started by jcano6979, Jun 1, 2010.

  1. jcano6979

    jcano6979 New Member

    hello, i was wondering, why coudnt you flip a hd hub around and use a 7 spd cassette or whatever u would use for bike gears on the engine side? Then use a normal one spd freewheel on the pedal side? This would allow you to shift gears on the engine side without a jackshaft kit, ie no extra rotating parts , and much simpler. If its an issue with the hub not accomodating it this way , then maybe someone can make a hub that would. or a motorcycle type trans that is on the motor itself. Just asking because it seems to me a way better way of implicating a drivetrain. Tell me what you think.
     

  2. cigron

    cigron Member

    The freewheel would be backwords. The chain you would have to use would brake
    All most right A way.
     
  3. jcano6979

    jcano6979 New Member

    why?

    How would the chain break? it holds up with the sbp kit? if the freewheel is backwards maybe reverse it or mount it backwards with a reverse thread? I may try to make this happen
     
  4. Neon

    Neon Member

    The chain may not break but it may not run on the sprockets without some serious modding or finding a completely different drive sprocket that has much thinner teeth. Otherwise the teeth will just skip over the chain and nothing will happen. The rear sprockets are on a freewheel already as you know. The dogs, pawls, teeth whatever you wish to call them are setup to grab in only one direction. Turning it around makes it so it runs in reverse or if you were coasting at all times. BTW Freewheels are more like ratchets. I suppose you could just simply weld the sprockets on the hub and be done with it. Then there is a problem of adding a derailleur. Most bikes are not setup to have derailleurs on the left side. Unless you manage to find an ancient derailleur that the axle held it into place. But again a skilled welder can fix that little problem. If you want to try this go ahead. I would love to see this come to light. Even better post pics.
     
  5. Neon

    Neon Member

    I also should have mentioned the gears are not quite right. 28-14 tooth usually don't quite cut it.
     
  6. Dilly Bar Rob

    Dilly Bar Rob Member

    Yep, that pretty much sums it up.

    Even if you did get the freewheel to work you would still need further gear reduction (jackshaft) to get the setup to work. Hmm, let me think, who makes something like that....SBP!

    Hey, I have an idea for you jcano - get yourself a stack of HT rear sprockets ranging from 50+ tooth to 32 (or whatever the largest/smallest sizes are) and weld up your own jumbo casette :idea:
     
  7. jcano6979

    jcano6979 New Member

    yes , the point is to eliminate the jackshaft, im talking about creating a simpler drivetrain with shiftable gears. I am looking for ideas, so far the rear hub looks like ill have to make a cassette of my own, on a sprag, maybe out of an automatic car trans. then comes the derailer ugh.
     
  8. Molotov256

    Molotov256 Member

    Very cool idea - if you get it to work, it'd undoubtedly be a popular mod.

    I've often thought it'd be nice even just to have 2 speeds on the motor side, maybe a 44T and a 32T.

    When I've ridden bikes with the SBP shift kit, I felt like the gear ratios were too close together. Rather than having 7 really close gears, I'd rather have 2 or 3 gears with wider range.
     
  9. cigron

    cigron Member

    If you have A idea good or bad. You can be sure some one
    else had the same idea. The fact that their none on the market
    should tell you some thing
     
  10. Neon

    Neon Member

    Jeez, why the doom and gloom Cigron? Just because it's not on the market doesn't mean you have to abandon all hope. Little problems can be sorted out if you just think them through. Sometimes you may even need a little help. I was told there was no way i was ever going to get an electric motor to work on a full suspension bike unless i used a hub motor. Well guess what i have a very operational, full suspension electric bike. It looks bad but operates pretty darn well. I have put on 587.35 miles in one month. Total time has been 6.51.06. Guess the attachment went through after all.
     

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    Last edited: Jun 3, 2010
  11. Neon

    Neon Member

    Please don't tell my local RCMP officer that this bike is highly illegal to be on the road. Right now he doesn't know the difference, i hope to keep it that way.
     
  12. cigron

    cigron Member

    I have been known to be wrong. Just ask my wife.
    I read that in cycle world magazine.It holds true most of the time
     
  13. GearNut

    GearNut Active Member

    I thought that all electric was allowed in Canada, just not gas powered MB's.
     
  14. jcano6979

    jcano6979 New Member

    I doubt it, because they are thinking bike parts , im thinking using car parts/motorcycle and adapting to my use, there is always another way to do something, it just depends how much efffort u use to develop it. Take for instance engine mounts, there are many billet parts manufactures for street rods etc that make nice brackets and stuff for holding just about anything, like gauges, maybe the gauge is the same size as the tubing and would clamp very nicely and look sweet as a motor mount.
     
  15. jcano6979

    jcano6979 New Member

  16. Neon

    Neon Member

    Gas powered bikes are allowed but they have to be registered, licensed and insured as a moped. At least here in New Brunswick anyway. It's not really worth the hassle. Unless they are kept off road. Then they have to be registered and insured as an off-road vehicle. There's some strict rules here for electric as well. I believe that the motor can't be any larger than 500 watt. It can't go any faster than 20 mph with the assist on. and the pedals still have to be there and function. Then there's the brake shutoff switches, they have to be there and function as well. I'm not sure about the shifting thing and no one can seem to tell me anything about it. The only law i'm breaking is the speed. I can go faster than 20 mph. The pedals still function but with a 20 tooth sprocket it's super easy to pedal. You can move your legs a lot but you won't go very fast. Doesn't matter what gear i have it in.
     
  17. Neon

    Neon Member

    However you gotta do it. Get 'er done
     
  18. Molotov256

    Molotov256 Member

    OMG!!!oneone11one!!!one111!!!

    Has anybody used those yet? I'm trying to think of how one could mod their engine to mount with those.... although motor mounts are totally unrelated to the OP; sorry to go on a tangent.
     
  19. jcano6979

    jcano6979 New Member

    i know , sorry about that i was responding to a reply earlier by cigron, who said all the good ideas have been thought about and didnt work basically
     
  20. jcano6979

    jcano6979 New Member

    so anyway, any ideas for a left side derailler?
     
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