what speed

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stuch

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Oct 27, 2011
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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
 
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The_Aleman

Active Member
Jul 31, 2008
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el People's Republik de Kalifornistan
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.
 
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stuch

New Member
Oct 27, 2011
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australia
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
 

The_Aleman

Active Member
Jul 31, 2008
2,653
4
38
el People's Republik de Kalifornistan
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?
[48, 30, 9T]
1st gear: 8MPH @ 4500RPM, 13MPH @ 7000

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

what if i changed the 30 tooth for a 36 drive what speed would this give
Subtract 10% from the speeds of the second set of figures I posted on Post #4.
 
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stuch

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Oct 27, 2011
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australia
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
 
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The_Aleman

Active Member
Jul 31, 2008
2,653
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38
el People's Republik de Kalifornistan
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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stuch

New Member
Oct 27, 2011
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australia
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.