Back when I ran a Durga, I was running 19T brushed at around 9.5:1.
To work out what gears you need for your 501, you need to know what pulleys it has in it, and also what spur gear.
19T is a bit soft for racing though, they struggle to get the car up the big jumps. Surprisingly enough a hotter modified is easier to drive, because you have power to spare.
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