Question about shifter kits.

Discussion in 'Motorized Bicycle General Discussion' started by Finfan, Jan 4, 2009.

  1. Finfan

    Finfan New Member

    Joined:
    Aug 29, 2008
    Messages:
    871
    Likes Received:
    1
    I was curious if it would be possible using Jim's clutch kit and a proper gearing on a shifter kit to make a bike that can start from a standing stop and has a top end of just under 20 mph? The first part would be just handy. The second part is inspired by a post I saw on the Spooky Tooth forum by a guy who was pulled over in Tucson when he was doing about 15 mph and written up for the "big 3" by a cop who said he was going over 20 mph. Apparently the cop didn't have a radar reading so it is just his word against the riders. If I ever get into this situation I would very much like to tell the judge it just isn't possible. There are apparently some cops in this town who are gunning for MB riders for whatever reason.
     
  2. misteright1_99

    misteright1_99 New Member

    Joined:
    Mar 21, 2008
    Messages:
    716
    Likes Received:
    0
    You can do that with a 50 tooth sprocket. I ran one for a while. Wouldnt go over 22 mph and at that speed the engine was screaming, and had loads of low end torque.
     
  3. Pablo

    Pablo Master Bike Builder & Forum Sponsor

    Joined:
    Dec 28, 2007
    Messages:
    3,652
    Likes Received:
    0
    Actually you don't even need the clutch kit to start off in first from a dead stop with a shifter kit. Just go. The only reason a I love the clutch kit is for the feel and smoothness, but again the stock clutch set up goes just fine without it.
     
  4. jasonh

    jasonh New Member

    Joined:
    Jun 23, 2008
    Messages:
    1,590
    Likes Received:
    0
    I haven't installed my CE actuator yet, but I can start from a dead stop easily with the shift kit.

    The only problem you would face is if AZ has stipulations about an auto trans. The shift kit turns it into a manual so you'd be up a creek. But it would be doable to gear to only do a max of 20 I think. Would likely need to be custom gears.

    misteright has a good point. Just use a 50T or higher. You'll be able to start from a dead stop, especially with Jim's kit, and you'll max out pretty low.
     
  5. old motorbike

    old motorbike New Member

    Joined:
    Sep 21, 2008
    Messages:
    352
    Likes Received:
    0
    I love that shift kit and hope Florida doesn't pass some stupid law like that.
     
  6. Pablo

    Pablo Master Bike Builder & Forum Sponsor

    Joined:
    Dec 28, 2007
    Messages:
    3,652
    Likes Received:
    0
    Well some states do have "transmission" laws for two wheeled vehicles but our viewpoint is that the rear derailleur or integral shifter hub are part of the bicycle and actually came with the bicycle and are used while pedaling the bicycle. Transmissions are in motorcycles. We have motored bikes!!
     
  7. NunyaBidness

    NunyaBidness Active Member

    Joined:
    Jun 29, 2008
    Messages:
    1,062
    Likes Received:
    1
    Also as far as I know, the law states that it cannot 'require' the operator to shift gears. The shift kit does not 'require' the operator to shift gears, it just allows the shifting of gears.
     
  8. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

    Joined:
    Jan 8, 2008
    Messages:
    11,529
    Likes Received:
    3
    Good loophole Nunya!
     
  9. Pablo

    Pablo Master Bike Builder & Forum Sponsor

    Joined:
    Dec 28, 2007
    Messages:
    3,652
    Likes Received:
    0
    That is good!!
     
  10. jasonh

    jasonh New Member

    Joined:
    Jun 23, 2008
    Messages:
    1,590
    Likes Received:
    0
    Just depends on your state really. I believe here it says it "must possess and automatic transmission" for a motorized bicycle.

    If I had the money, NuVinci is going to be putting out a developer's kit for LEV's (light electric vehicles...also includes small gas powered stuff) that has their CVP, plus a programmable shift controller and actuator - so you can turn it into an automatic (And I think it still allows you to shift manually if I'm not mistaken)
     
  11. Pablo

    Pablo Master Bike Builder & Forum Sponsor

    Joined:
    Dec 28, 2007
    Messages:
    3,652
    Likes Received:
    0
    Jason - that sounds very cool. Do yo have a link???
     
  12. jasonh

    jasonh New Member

    Joined:
    Jun 23, 2008
    Messages:
    1,590
    Likes Received:
    0
  13. TigerToothBikes.com

    Joined:
    Jun 25, 2008
    Messages:
    455
    Likes Received:
    0
    holy crap that'd cost a bomb
     
  14. Pablo

    Pablo Master Bike Builder & Forum Sponsor

    Joined:
    Dec 28, 2007
    Messages:
    3,652
    Likes Received:
    0
    Yeah, I'm thinking!
     
  15. jasonh

    jasonh New Member

    Joined:
    Jun 23, 2008
    Messages:
    1,590
    Likes Received:
    0
    If I had a spare $600 laying around, I'd totally get it. But I don't so I won't :)
     

Share This Page