Sprocket size for a little guy w/ a 70cc HT bicycle engine

Discussion in 'Motorized Bicycle General Discussion' started by tylerlough, Jul 24, 2008.

  1. tylerlough

    tylerlough New Member

    Joined:
    May 28, 2008
    Messages:
    109
    Likes Received:
    0
    I'm looking to bring the noise down and fuel economy up when cruising at 25, via a smaller sprocket.

    I weigh about 130lbs and my bike w/motor weighs 55lbs.

    How does a 30 tooth sprocket sound?
     
  2. azbill

    azbill Active Member

    Joined:
    May 18, 2008
    Messages:
    3,367
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    you might have to pedal a bit to get started
    a 36 would be less pedalling
    andyinchville could give better advice (he sells sprockets...see ad on left side of page)
     
  3. Captain Trips

    Captain Trips New Member

    Joined:
    Jul 16, 2008
    Messages:
    6
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    I purchased a 36T from him and I will say, You pay for what you get. And what you get is a really nice American made sprocket. I love mine. I have to let the clutch out more gradually, but that's fine.
     
  4. tylerlough

    tylerlough New Member

    Joined:
    May 28, 2008
    Messages:
    109
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    I'm thinking a 32 tooth sprocket, need new brake pads first though. How good are These pads from delta.

    Thanks
    Tyler
     
  5. Andyinchville1

    Andyinchville1 Manufacturer/Dealer

    Joined:
    Dec 26, 2007
    Messages:
    502
    Likes Received:
    1
    Re: Sprocket size for a little guy w/ a 70cc HT

    HI Guys,

    Thanks for the kind words....As far as going to a 30T sprocket....If you are in a relatively flat area, live at not too high an altitude, and plan on not having a lot of stop and go or slow speed operation....a 30T should be OK....I have sold as low as 27T to a group of people in FL and they seem to be fine with it (First one man bought a 27T then later all the guys friends also bought some from me....I guess that had to try to keep up with their buddy and his small sprocket!)...

    FWIW and if you want to save a few $$....Our best sellers are 34T sprockets and they typically sell on eBay for around $20 or so.


    Hope this helps you. Good luck in your build and ride safe!

    Andrew
     
  6. tylerlough

    tylerlough New Member

    Joined:
    May 28, 2008
    Messages:
    109
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    The Florida guys is a case were bigger isn't better.

    Thanks for your help.
     
  7. cachehiker

    cachehiker New Member

    Joined:
    Jul 9, 2008
    Messages:
    35
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    I'd try Kool Stop Salmons before I'd use the Azteks on a motorized rig.

    They are good pads and work great on my 23 lb. hardtail but they weren't up to repeatedly bringing my 50 lb. commuter with a rack and panniers to a stop at the bottom of a 40 mph hill. After a while they glazed over and now they squeal like a pig.

    :ride:
     
  8. tylerlough

    tylerlough New Member

    Joined:
    May 28, 2008
    Messages:
    109
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    I'll try the Azteks, then switch to the more durable Kool Stops if the delta Azteks don't work out.
    I'm also use to squealing brakes.
     
    #8 tylerlough, Jul 25, 2008
    Last edited: Jul 25, 2008
  9. Drewd

    Drewd New Member

    Joined:
    Jul 25, 2008
    Messages:
    425
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    You should consider getting one of those neat shifter kits I just read about. I gotta get one of those but don't have the money as of yet.
     
  10. tylerlough

    tylerlough New Member

    Joined:
    May 28, 2008
    Messages:
    109
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    I've got the money for Paul's kit but would rather spend the money on school.
     
  11. tylerlough

    tylerlough New Member

    Joined:
    May 28, 2008
    Messages:
    109
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    Just found out boygofast gave me more metal then he said. I received a 50tooth with the kit instead of the 44 tooth like the description said.

    This means I can go
    27 mph with a 50T
    30 mph with a 44T
    almost 34 mph with a 40T
    37.5 mph with a 36T
    39.7 mph with a 34T
    42.2 mph with a 32T
    45 mph with a 30T
    50 mph with a 27T

    These numbers are based upon me having a 27mph top speed on a 50T with the engine screaming, ready to blow a part.

    Now I'm looking at getting a 32T to keep top speed around 40mph.
     
    #11 tylerlough, Aug 3, 2008
    Last edited: Aug 3, 2008
  12. tylerlough

    tylerlough New Member

    Joined:
    May 28, 2008
    Messages:
    109
    Likes Received:
    0
    Re: Sprocket size for a little guy w/ a 70cc HT

    Would cruising at 32 mph be too much for the Kulana Moon Dog to handle? I know it will have good brakes, but will I beat the crap out of the bike riding it this fast?
     
    #12 tylerlough, Aug 3, 2008
    Last edited: Aug 4, 2008

Share This Page