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Using the sprocket calculator, it looks like about as big as you can fit on a 250D with the lower sprocket skid plate is probably around 46 teeth with a sprocket diameter of ~7.3" diameter. Thats about equivalent to going from a 12/40 to a 10/40 sprocket ratio (3-4 rear teeth per 1 front tooth). Assuming I go with a 12/46.
That's going from a 2.67 ratio to a 3.83 ratio, 43% higher.
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