Very simple explanation (mechnically)to this is that the stroke in cruisers are usually longer as in the case of a bullet and shorter in the case of sporty bikes. Longer the stroke, more time it takes to complete a full power stroke even though the displacement is high. Since the final horse power is indirectly related to the stroke and bore dimensions. It's always been like this longer stroke engines have good Torque while the shorter ones have good Bhp. But if u are a smart and a good rider u can challenge the sport bikes with the extra torque u have in ur cruiser!!!!!!
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