A standard sprocket setup is typically 14/42, with a 14-tooth drive sprocket and a 42-tooth rear sprocket. Manufactures are known to target a wider consumer base by setting up pit bikes with a sprocket combination that provides overall performance. The smaller drive sprocket and the larger rear sprocket on a pit bike produce a base gear ratio. Larger 140-cc pit bikes with stock sprocket gearing are capable of a 70-mph top speed in high gear. On longer sections, the bike can reach top speed in the range of 50 mph. On short sections in lower gears, top speed might range from 15 to 25 miles per hour with a 50-cc bike. In keeping with typical dirt bike riding, pit bikes are engineered to reach maximum rpm quickly in each gear. Some manufacturers produce versions with 175- and 250-cc engines, but these exceed the mini-moto class that typifies pit bikes. Standard pit bikes engines range from 50 cc to 140 cc.
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