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Hi OldMiniBikes. I just purchased a tav 30 Chinese copy with a 10 tooth sprocket. For my off road go kart. So at the moment my gear ratio is 4.8:1(10 drive sprocket and a 48 wheel sprocket) with a 13" tire. Driver and kart weighs roughly 370ish lb. At the moment on hard ground it hits the 4500 max...