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On 12V that setup will go about 20km/h Sounds a good speed and instant acceleration (wheelies garantied)
And I dont see any reason why chain cant be used. But for a 2wd I keep with the MSR gearboxes.
And if 4WD (or more) is needed, timing belt or poly V belts will do nicely for me.
You should only look at the peak current the speed controller can take in a burst, the nominal amperage of a speed 900 is about 8A. If you run the 900s at stall constantly you are doing something horribly wrong. Both the Scorpion XXL and the Sabretooth 25A will handle the speed 900s just fine.
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