Different people prefer different cadences. The general rule is 80-100 rpm for optimum efficiency. Beginners tend to be on the lower end and even into the 70's. I've always been a spinner. I ride at 95-105 most of the time. My wife who has been riding for quite a while is comfortable in the mid 80's. Find your cadence and shift gears to maintain that cadence for whatever speed you are going.