what speed

Discussion in 'Motorized Bicycle General Discussion' started by stuch, Feb 11, 2012.

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  1. stuch

    stuch New Member

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    what speed should i get from a honda gxh50 with 4g t belt trans with 5;1 gearing running through a sbp shift kit 17 tooth left side sprochet and a 9 tooth right side on to a 44 tooth chain ring and a 30 tooth drive on to a 6 speed cassete 28 tooth low gear and a 14 tooth high gear
     
    #1 stuch, Feb 11, 2012
    Last edited: Feb 14, 2012
  2. Ibedayank

    Ibedayank New Member

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    and what rpm is the motor turning at?
    rear wheel size?
     
  3. stuch

    stuch New Member

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    i have been told they rev to about 7500 rpm 26 inch wheel
     
  4. The_Aleman

    The_Aleman New Member

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    I don't know your exact gear cluster set, so I'll just post results for your 1st and 6th gear. All speeds are ±1MPH.

    [44, 30, 10T]
    1st gear: 9MPH @ 4500 (torque peak), 14MPH @ 7000 (horsepower peak)

    6th gear: 18MPH @ 4500, 28MPH @ 7000RPM

    The SBP gears you posted are for the 2-stroke kit tho. The 4-stroke kit comes with a 48T outer, 30T inner, and a 10T j/s output standard. Ofc, the gears can be substituted. I recommend using a 48T outer crank, 36T inner crank, and 10T jackshaft output. I use those gears on my 4-stroke shifter, and the ratios are fine. Here's what you'd be running with those gears:

    [48, 36, 10T]
    1st gear: 11MPH @ 4500RPM, 17MPH @ 7000RPM

    6th gear: 22MPH @ 4500, 34MPH @ 7000

    As you see, with the 2nd set of gears, you get a better cruising speed and still have a lot of hillclimbing ability.
    Hope this helps.
     
    #4 The_Aleman, Feb 14, 2012
    Last edited: Feb 16, 2012
  5. stuch

    stuch New Member

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    thank you very much this is a great help
     
  6. stuch

    stuch New Member

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    hi i checked the sprockets jack shaft left side 17 tooth right 9 tooth 48 tooth chain ring 30 tooth drive on to 28 tooth low and 14 high 6 speed cassette. what speed would this give me? what if i changed the 30 tooth for a 36 drive what speed would this give
     
  7. The_Aleman

    The_Aleman New Member

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    [48, 30, 9T]
    1st gear: 8MPH @ 4500RPM, 13MPH @ 7000

    6th gear: 16.5MPH @ 4500, 26MPH @ 7000

    Subtract 10% from the speeds of the second set of figures I posted on Post #4.
     
    #7 The_Aleman, Feb 16, 2012
    Last edited: Feb 16, 2012
  8. stuch

    stuch New Member

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    wouldn't having the bigger drive eg36 tooth give more speed than a 30 tooth drive
     
  9. The_Aleman

    The_Aleman New Member

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    Yes, but on the second set of figures on post 4, that's using a 10T j/s output. You asked for those figures with a 9T. -10%
     
  10. stuch

    stuch New Member

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    ok .what would happend if i went to a 38 tooth drive with 9 tooth jack? sorry to be a pain it just that i have a 38 tooth here. no 10 tooth here
     
    #10 stuch, Feb 16, 2012
    Last edited: Feb 16, 2012
  11. The_Aleman

    The_Aleman New Member

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    That's only 1-2MPH difference in anything. You need bigger jumps: 30 to 36, 36 to 40 or 44. And 44 is almost too much with 48T outer.
     
    #11 The_Aleman, Feb 16, 2012
    Last edited: Feb 16, 2012
  12. stuch

    stuch New Member

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    so a 38 tooth + 9 tooth would be about the same as 36 tooth +10 tooth i'm just trying to use what i have here
     
  13. The_Aleman

    The_Aleman New Member

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    38+9 is the 36+10 -10% and add 1MPH on low end and 2MPH on high end.
     
  14. The_Aleman

    The_Aleman New Member

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    There is a gear calculator that many of us here use, it can be easily configured for SBP setups. I'll show you how:

    1: Get the /ratiocalc from this post. Save the program to your desktop.

    2: Run the gearratio.exe (or whatever.exe you renamed it)

    3: Enter the values in the attached picture, that's your 6th gear. These are the base numbers you can refer to.

    You can probably figure out which ones to change from there...this way, you can play around with the gears whenever you want!
     

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    #14 The_Aleman, Feb 17, 2012
    Last edited: Feb 17, 2012
  15. stuch

    stuch New Member

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    thank you for your help. one more ? do you think the gxh 50 with a 11 jack shaft on to 48 tooth chain ring 38 tooth drive will it have enough power to pull a 205lbs bloke along.
     

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