I'm pretty sure I'm going to use a 1in axle. Seems to be most common. If the length is correct I'll get one with the threaded and stepped ends.
I just wanted to let you know that I am still working on this. I located the freewheel adapter for a 1" axle plus the freewheel and axle sprocket. I need to take some measurements off of our motor sprockets to see which motor will work with the axle sprocket. We will definitely have all the parts that you will need to build this vehicle. I will reply to this forum again once I have all of this figured out.
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SPD-CT660B9 $54.95 (controller)
Your choice of throttle $19.95-$29.95
3 QTY BAT-12V18A $54.95 each (might be able to use 12V12Ah batteries ($39.95 each) instead but that would be cutting it close to the 1/2 hour ride time)
CHR-36V2.5AXLR $43.95 (charger)
CNX-XLR05W $6.96 (charger port)
Depending on which throttle you choose a key or power switch may or may not be needed.
With these parts the kit is going to cost around $500.00. I can also design this kit with a 24 Volt 450 Watt gear motor with a cost of around $350-$400. The 450 Watt gear motor is not as large or powerful as the 600 Watt gear motor and uses #410 bicycle chain instead of #41 motorcycle chain.
I need to ask a few questions before I can make the kit:
Would you prefer the 600 Watt or 450 Watt Kit?
What is the item number of the throttle that you want to use? http://www.electricscooterparts.com/throttles.html
How many feet of chain do you need?
I recommend choosing a 36 Volt (for 600 Watt kit) or 24 Volt (for 450 Watt kit) throttle with a key switch built into it.
Please let me know if you have any questions.
And here is the gear ratio and top speed calculation with the 44 tooth sprocket:
The lower the top speed the more torque the tricycle will have for climbing hills, pulling weight, and going through sand. There is not a huge difference in top speed between the two sprockets though so the difference in torque will most likely not be very significant.
If you would like any changes made to the kit, or if you have any questions before or after you buy the kit please let me know.
Please let me know if you have any further questions.